First, write the number directly.
0.5×8= 3.6×0.4= 39.68×0= 47.6× 1=
4÷0.5= 12÷0.06= 12÷ 1.2= 3÷30=
0. 15×7= 3.2×6+3.2×4= 2.5×4×0.36=
0.2+0.8×0.5= 6.03× 1000= 10×0.6= 6.45×0.0 1=
0. 1×0. 1= 0.24×0.5= 5.4+3.6= 1.25-0.25=
10.2×4.5= 2.5×6= 9×0.25= 0. 125×4=
1.25×8×0.5= 16×0.0 1= 1.78÷0.3= 0.27÷0.003=
0.0 1÷0. 1 = 1.8×20 = x-0.4x = 5d-2d =
3.6÷0.4= 0.6×0.8= 2.4×3= 0. 12×0.7=
4÷5= 1.6÷0.5= 0.2÷0.05= 2.5×2.3×4=
1.5÷ 1.5+ 1.5= 3.6- 1.2÷2.4= 4.7×6+4×4.7=
0.5×4÷0.5×4= 38.5×0×0.38= 0.6×0.8= 3×0.9=
2.5×0.4= 3.6×0.4 12.5×8= 50×0.04= 80×0.3= 1. 1×9
Second, use vertical calculation.
8.08-2.68= 5.546+29.38= 17.04×0.26 = 8.35×3.5=
Three, vertical calculation (decimal places)
0.43×0.29≈ 52.6×0.23≈ 4.58×0.37≈
Four, longitudinal calculation (two digits after the decimal point)
4.3×8. 14≈ 27.6×0.45≈ 27.6×0.45≈
20÷ 12≈ 2.9× 1.8≈ 5.08×0.25≈
Five, vertical calculation (three digits after the decimal point)
2.5÷0.7= 2.5÷0.7= 3.25×9.04=
Six, vertical calculation (expressed by cyclic decimal quotient)
36.8÷ 16≈ 10. 1÷3.3≈ 15.3÷ 1 1≈ 0.78÷ 1≈
Seven, off-type calculation
(2.65+2.77)÷( 1.98-0.98)= 3.7×9 1.6+6.3×9 1.6=
0.45× 12×0.2= 6.2×2. 1-2. 12.8-2.8×0. 15=
2.8× 1.43+0.57= 10-6.06+8.5=
6×0.25× 1.8= 144÷3.6+27.2=
0.87×3. 16+4.64= 6.8×0.75÷0.5=
13.75÷0. 125–2.75= 53+23.4÷7.2=
2.88 1÷0.43-0.24×3.5= 28-(3.4+ 1.25×2.4)=
(3 1.8+3.2×4)÷5= 3 1.5×4÷(6+3)=
0.64×25×7.8+2.2= 2÷2.5+2.5÷2=
194-64.8÷ 1.8×0.9= 36.72÷4.25×9.9=
5 180-705×6= 24÷2.4-2.5×0.8=
3.4 16÷(0.0 16×35)=
Calculate the following problems in a simple way.
5. 12+2.54+4.88= 12.5× 17.8×0.8= 9.9×2.5=
9.4×5.8+ 10.6×5.8= 0. 125×0.32×0.25= 9.6+9.6×99=
2.8×7.6+ 1.4×2.8 +2.8= 6.3× 10. 1= 0.25×3.2× 12.5=
12.5×9.7? 12.5×8.7= 3.7×9 1.6+6.3×9 1.6=
16.84÷40÷0.25= 12.5×0.4×2.5×8= 9.5× 10 1=
4.2×7.8+2.2×4.2= 2.55×7. 1+2.45×7. 1=
Nine, solve the equation
4(x+0.3)= 4.8 1.2x-0.8x = 9.6 20+x = 36
7x-55 = 59 0.7 x = 4.2( 10-7.5)x = 1
X× 1.8 = 0.972 0.06×X = 1.02 X÷0. 13 = 0.7
12.4÷X=3 1
X. formula calculation
(1) 25 times a number is 37.75. What's this number?
(2) What is the number that is 42.5 greater than the quotient of 47.88 and 3.8?
(3) What is the difference between1.25 times 4.2 and 5?
(4) How much is 3.05 times more than 65438+4.7?
25 times a number is 37.5. What's this number?
(6) What is the number 42.5 greater than the quotient of 47.88 and 3.8?
60 is a multiple of 30 less than 3. What's this number?
Four times a number is 24 more than 60. What's this number?
(9) Multiply the sum of 14.8 1 and 5. 19 by their difference. What is the product?
What is the product of the sum of (10) 126.8 and 15.7 times 1.02?
(1 1)0.6 times 0.8 plus the product of 0. 12, and then divided by 1.2, what is the quotient?
XI。 Application problem
(1) The construction team dug a tunnel with a length of 0.7 km, instead of digging 0.024 km every day, it took 15 days. The remaining 10 days to complete. How many days do you dig every day on average?
(2) Grade six students planted 276 trees, 20 more than grade five (1.5 times). How many trees were planted in the fifth grade?
(3) In the flood fighting and disaster relief fund-raising activities of Yuanming Primary School, the fifth and sixth grades donated 902 yuan. There are four classes in grade five, with an average donation of 90.5 yuan per class and four classes in grade six. What is the average donation per class?
(4) Baiyun Cement Plant plans to produce 387.5 tons of cement in 25 days. Due to technical improvement, the actual output is 9.5 tons more than originally planned. How many days does it actually take to complete the original planned task?
(5) The clothing factory used to make a set of children's clothes, and the fabric needed was 2.2 meters. Now the cutting method has been improved, and each set saves 0.2 meters of cloth. Originally, the cloth used to make this kind of clothes was 1, 200 sets. How many sets should we make now?
(6) The distance between the two cities is 425 kilometers, and a bus and a truck are driving in opposite directions from both places at the same time. The bus travels 45 kilometers per hour and the truck travels 40 kilometers per hour. How many kilometers did the bus travel when they met?
(7) The distance between Party A and Party B is 520km. It takes 8 hours for a truck to drive from Party A to Party B, and 65,438+00 hours for a bus to drive from Party B to Party A. Both cars are driving in opposite directions from Party A and Party B at the same time. A few hours later, the distance between the two cars was 52 kilometers.
(8) There are 290 tons of goods in the warehouse, which have been transported 100 tons in four days. According to this calculation, how many days will it take for the remaining goods to be shipped out?
(9) 290 tons of goods in the warehouse should be shipped within one week. 65,438+000 tons have been shipped in the first three days. How many tons do you have to transport every day to finish the task on schedule?
(10) The distance between Party A and Party B is 44 1km. Buses travel 50 kilometers per hour, 2 kilometers faster than trucks. Two cars leave from Party A and Party B at the same time. How many hours did it take for two cars to meet?
(1 1) Village A and Village B jointly dig a canal with a length of1390m. A village dug from east to west. I dug 75 kilometers a day and dug for 2 days. Village B began to dig from west to east, so it took another 8 days to complete the task. How many meters does Village B dig on average every day?
(12) It takes 1.5 hours for a car to drive from place A to place B. When it returns from place B to place A, it is 10 kilometers per hour, which is less than when it goes 1 hour. How many kilometers is it between A and B?
(13) Xiao Zhang rides a motorcycle from place A to place B. If he drives at a speed of 56 kilometers per hour, he can arrive in 4 hours. If he arrives half an hour early, what's his speed?
(14) A pile of coal was originally planned to burn for 25 days, but actually burned for 6 days; The original plan was to burn 12.4 tons of coal every day. How many tons of coal are actually burned every day? How many tons of coal are actually saved every day?
(15) The original seat of Shengli Cinema was 32 rows, with an average of 38 people in each row. After the expansion, it increased to 40 rows, 624 more people than before. How many people can sit in each row after the expansion?
(16) There are 360 more poplars than willows on campus, and the number of poplars is 2.5 times that of willows. How many poplars and willows are there respectively? (Equation Solution) (17) The street billboard is a parallelogram with a base length of12.5m and a height of 6.4m.. If you want to paint this billboard, you should use 0.6 kilograms of paint per square meter. How many kilograms of paint should you prepare at least? (18) A trapezoidal forest with an upper bottom of 80 meters, a lower bottom of 95 meters and a height of 50 meters. If each tree covers an average area of 2.5 square meters, how many trees can be planted in this land?
(19) Last year, the TV factory produced an average of 1 1250 TV sets per month. The output in the eight months of this year is as much as that in the whole of last year. According to this calculation, how many TV sets will the factory produce this year?
(20) The master and the apprentice * * * processed 208 machine parts, and the number of parts processed by the master was four times that of the apprentice. How many parts did the master and the apprentice each process?
(2 1) There is a triangular experimental field with a bottom of 250m and a height of180m. * * * The annual grain output is 4.5 tons. What is the average grain output per hectare?
(22) There is a flat triangular Chinese cabbage field with a base height of 27.6m and a height of15m. Each Chinese cabbage covers an area of 1.8 square decimeter. How many Chinese cabbages can be planted in this land?
The fish pond is trapezoidal in shape. Its upper bottom 18m, lower bottom 42m and height 12m. There are 320 fry per square meter. How many fry does this fish pond need?
(24) Team A builds 0.54km of roads every day, which is 0. 18km less than that of Team B. How many kilometers does Team B build roads every day?
(25) Wang Yong, Li Minghe, rode relatively from county towns A and B, with a distance of 45.6 kilometers, while Wang Yong rode 5. 1 km in Li Mingxian. It is known that Li Ming's cycling speed12km, and Wang Yong's cycling speed15km. How many hours did they meet after Wang Yong started?
Teacher Wang bought some basketball for the school. She bought 15 basketballs for the first time and 29 basketballs for the second time. The difference between the two payments is 64 1.2 yuan. How much did Miss Wang pay for the first time?
(27) An express train and a local train leave from Party A and Party B at the same time, in opposite directions. Five hours later, the two trains met. After the encounter, the express train continued to leave for three hours and arrived at Party B. It was known that the local train was 48 kilometers per hour. What is the distance between Party A and Party B?
(28) Passenger cars and trucks travel in opposite directions at the same time from two places 852 kilometers apart. When they meet, the distance of the bus is twice as short as that of the truck, which is 189km. How many kilometers are buses and trucks? (Equation solving)
(29) Reading a story book takes 24 days for my sister to read the whole book and 32 days for my sister to read the whole book. As we all know, my sister reads four pages more than my sister every day. How many pages does my sister read every day?
At the same time, two motorboats sailed from Donggang to Xigang, with a distance of 324 kilometers. When ship B arrived at the west port, ship A was 52.8 kilometers away from the west port. Assuming that ship A travels 45.2 kilometers per hour, how many kilometers can ship B travel per hour?
There are two baskets of apples in (3 1)A and B. The number of apples in A is 2.4 times that in B. If 35 apples are taken from A and put into B, the number of apples in two baskets is equal. How many apples are there in each basket? (Equation solving)
(32) In the fifth grade, buy a batch of notebooks and give them to miyoshi students. If each student is awarded 5 notebooks, there are still 3 notebooks. If six books are awarded to each person, there will be 12 books missing. How many outstanding students will be awarded in the fifth grade? How many notebooks did you buy?
(33) There are 1.5 hectares of triangular vegetable fields. If its bottom is125m, what is its height? There is a triangular wheat field 45 meters underground, with a height of 86.2 meters. If 4600 kilograms of wheat can be harvested per hectare, how many kilograms of wheat can this land harvest?
(34) The speed of high-speed rail is 280 kilometers per hour, which is more than four times that of ordinary trains. How many kilometers per hour does the ordinary train run?
(35) A classroom is10m long and 7m wide. If the ground is paved with square bricks with a side length of 2 meters, how many pieces do you need for a * * *?
(36) There are 45 students in Class A, and the number of students in Class B is 7 1.2 times less than that in Class A. How many students are there in Class A and Class B?
(37) Guangxin Machinery Factory wants to produce 3,000 threshers, and has produced 600 in the first five days. According to this calculation, how many days will it take to produce the rest?
38. The grain store sent 30 bags of rice and 40 bags of flour. A * * * 2500 kg, 50 kg of rice per bag. How many kilograms is each bag of flour?
The plane flies 860 kilometers per hour, 20 kilometers more than the train. How many kilometers does this train run per hour?
(40) Two cars, A and B, set off from two places 480 kilometers apart at the same time and met after 3.2 hours. It is known that car B travels 72 kilometers per hour, and how many kilometers does car A travel per hour?
(41) Two ships, A and B, sailed from Shanghai to Wuhan at the same time. Spacecraft A travels at a speed of 24 kilometers per hour. After eight o'clock. In 5 hours, Ship A overtook Ship B by 5 1 km. What's the speed of the B ship?
(42) There are 126 cypresses and poplars in the school, and the number of cypresses is six times that of poplars. How many cypresses and poplars are there respectively?
The price of air conditioner is three times that of TV set. The school bought an air conditioner and four televisions, which cost 8400 yuan. How much is an air conditioner and a TV set?
Eight baskets of apples are 40 kilograms heavier than eight baskets of pears. As we all know, a basket of pears weighs 20 kilograms. How much does a basket of apples weigh?
(45) To build a road with a length of 1960m, 80m will be built in one day. Eight days later, in order to complete the project as soon as possible, it is planned to build 120m in one day. How many days will it take to finish it?
Dad is 36 years older than Xiao Fang this year. It is understood that Dad is four times older than Xiao Fang. How old are Dad and Xiao Fang this year? 10. Two cars, A and B, leave from two places 420 kilometers apart at the same time. The speed of a car is 1. It's five times that of B. After 2. Four hours later, they met. How many kilometers do A and B travel per hour?
A cow weighs 850 kilograms and an elephant weighs 500 kilograms, which is more than five times that of this cow. How much does this elephant weigh?
(48) There are fewer students in Guangxin Primary School than Hongyang Middle School 1260. It is known that the number of students in Hongyang Middle School is 2. It is five times that of Guangxin Primary School. What are the numbers of Hongyang Middle School and Guangxin Primary School respectively?
Xiaolan and Xiao Fang walk in opposite directions from one point on the circular runway at the same time. Xiaolan walks 65 meters per minute, and Xiao Fang walks 75 meters per minute. After 2. Five minutes later, they met. What is the total length of this circular runway?
(50) On Arbor Day, students planted poplar 12 rows, fir 8 rows, 300 plants in a row, each row 15 plants. How many poplars are there in each row?
(5 1) The circumference of a rectangle is 64 cm, and the known length is three times the width. What is the length and width of this rectangle?
(52) Triangular plot, with an area of 60m2 and a known base of15m. What is its height?
(53) Clothing factory has produced 6500 suits 15 days, with an average of 200 suits per day. How many days does it take to produce 50 more suits every day?
(54) Two cars of Party A and Party B leave from two places 665 kilometers apart at the same time. The average speed of a car is 82 kilometers per hour, and the average speed of b car is 73 kilometers per hour. How many hours later, the two cars are still 45 kilometers apart?
(55) Young Pioneers went to the orchard to pick apples, and picked 14 baskets in the morning, each of which was 25 kilograms; I picked 18 baskets in the afternoon. On this day, I picked 890 kilograms. How many kilos are there in each basket of apples picked in the afternoon?
A pen and a ballpoint pen are 8. 3 yuan, the price of a pen is twice that of a ballpoint pen. 0.8 yuan, how much is a pen and a ballpoint pen?
XII. True or false questions
1.\x09 Square, rectangle, parallelogram and trapezoid are all special quadrilaterals. ()
2.\x09 The volume of a cylinder is three times that of a cone, and the base and height of the cone must be equal. ()
3. The scale of \ x09 is the ratio of the previous paragraph to 1. ()
4.\ x09 1kg metal ratio 1kg cotton weight. ()
5. \ x091100 and 1% are fractions with the denominator of100, which have the same meaning. ()
6. The volume of a cone is 2/3 smaller than that of a cylinder. ()
7.\x09 Two rays can form an angle. ()
8. After a rectangular wooden frame is drawn into a parallelogram, the sum of the internal angles of the four corners remains unchanged. ()
9.\x09 In any cuboid, only two opposite faces are completely equal. ()
10.\x09 Two rectangles with equal perimeters must have the same area. ()
1 1.\x09 The bottom area of an object with a volume of 1 cubic decimeter must be 1 square decimeter. ()
12.\x09 The bottom area of a cube with a volume of 1 cubic decimeter must be 1 cubic decimeter. ()
13.\x09 The working efficiency is inversely proportional to the working time. ()
14 ratio. \x09 increased 10%. To keep the proportion unchanged, the latter term should be multiplied by 1. 1. ()
15. \ x095kg of salt is dissolved in100kg of water, and the salt content of brine is 5%. ()
16.\x09 If the scale is large, the actual distance is also large. ()
17.\x09 If the perimeter of a square is equal to the perimeter of a circle, then the area ratio of the square to the circle is π∶4. ()
18.\x09 The smaller the decimal value, the smaller the decimal unit. ()
19.\ x097m 1/8 is as long as 8m 1/7. ()
20.\x09 Two straight lines that do not intersect are called parallel lines. ()
2 1.\x09 Xiao Wang processed 99 parts, 99 of which were qualified, and the qualified rate of these parts was 99%. ()
22.\x095 worker thread processes 5 parts in 5 hours, so 1 worker thread processes 1 parts in 0 hours. ()
23.\x09 Add two zeros at the end of a number, and the original number will be expanded by 100 times. ()
24. There are 365 days in a year. ()
25. The area and volume of the bottom of the cylinder have been tripled. ()
26.\x09 12/ 15 cannot be converted into a finite decimal. ()
27.\x09 Numbers divisible by 3 must be divisible by 9. ()
28.\x09a, b and c are three natural numbers (and not equal to 0), in a = b× c.
A and b must be divisors of a ()
B and c must be the greatest common divisor of a and B. ()
C and a must be the least common multiple of a and B. ()
D and a must be common multiples of b and c. ()
29.\x09 The sum of two acute angles must be obtuse. ()
30.\x09 Proportionally, if two internal terms are reciprocal, then two external terms are reciprocal. ()
3 1.\x09 The words "net content: 250ml" are written on the "Guangming" milk packaging box, and this 250ml refers to the volume of the packaging box. ()
32.\x09x+y=ky(k is certain), then x and y are out of proportion. ()
33.\x09 For the same section, Party A needs 5 hours, Party B needs 4 hours, and the speed ratio of Party A and Party B is 5:4. ()
34.\x09 An angle greater than 90 is an obtuse angle. ()
35.\x09 Any number divisible by 2 is even. ()
36.\x09 equations are all equations, so equations are also equations. ()
37.\x09 Because 1.5÷0.5=3, 1.5 can be divisible by 0.5. ()
38.\x09 When a number is multiplied by a decimal, the product must be less than this number. ()
39.\x09 When an integer is divided by a decimal, the quotient must be greater than the integer. ()
40.\x09 Multiplying a number by 0.05 means finding five percent of this number. ()
4 1.\x09 The area of parallelogram is larger than that of triangle. ()
42.\x09 Two trapezoids with the same shape have the same area. ()
43.\ x093× b+5 can be written as 3+5b. ()
44.\x09a3 must be greater than 3a. ()
45. \ x09 "0" means there is no object, so 0 is not a number. ()
46. Divide 0 by any number to get 0. ()
47.\x09 Natural numbers can indicate both "how much" and "which one". ()
48.\ x09 "There are three passengers living in Room 3." The two 3s in this sentence have different meanings. ()
49.\x09 If 1÷a=b, then A and B are reciprocal. ()
50.\x09 is greater than 1.4 and less than 1.6, and only one decimal is 1.5. ()
5 1.\x09
52.\x09 If the score is less than its reciprocal, it must be a true score. ()
53.\x09 When a number is multiplied by a true fraction, the product is less than the multiplicand. ()
54.\x09 False score is definitely not the simplest score. ()
55.\x09 The score is less than an integer. ()
56. The numerator and denominator of the \ x09 fraction are multiplied or divided by the same natural number at the same time, and the size of the fraction remains unchanged. ()
57.\ x09 17.85000ml = 85l = 85cm。 ()
58. Products of 0. 25 is 1. ()
59. The second half of February in a normal year is 9 days. ()
60.\x09 1996 is a leap year, when the 6th Olympic Games was held in the United States. Therefore, every four years the Olympic Games will be held in leap years. ()
6 1.\x09 The clock turns once every minute, and the hour hand turns 30. ()
62. None of the four zeros of x0955005500 have been read. ()
63.\x09 A fraction, the larger the denominator, the larger its fractional unit. ()
64.\x09 The maximum decimal counting unit is 80% smaller than the maximum size unit. ()
65.\x09 unit of volume is greater than the area unit. ()
66.\ x09 and b are natural numbers. If A ÷0.52= B, then A must be less than B. ()
67.\ x095.27 is a cyclic decimal. ()
68.\ x 097.8+7.8+2.2+2.2 =(7.8+2.2)×2。 ( )
69.5 times \ x09x is 0.7 less than 3.2, and the column equation for finding x is 5x-3.2=0.7. ()
70.\x09 The value of the unknown quantity that makes both sides of the equation equal is called solving the equation. ()
71.\ x09 15 ÷ 10 = 1.5, it can be said that 15 is1.5 times that of 10, so/
72.\x094.9 divided by the quotient 3 of 1.6, the remainder is 1. ()
73.\ x09。 70% is 70% when converted into percentage. ()
74.\ x 09 1+0 30% of the meter is 30% of the meter. ()
75.\x090.8 and 0.800 have the same size and the same counting unit. ()
76.\x09 add 0 after the decimal point, and the size of the decimal point remains unchanged. ()
77.\x09 Add a "%"after 20, which is 100 times less than the original number. ()
78.\x09 If the number A is increased by 100%, which is exactly equal to the number B, then the original number A is twice that of the number B.. ()
79. If there are 4% fewer girls than boys, then there are 4% more boys than girls. ()
80. Flour is 45 tons less than rice. If rice and flour are sold at 40% each, rice is 45 tons more than flour. ()
8 1.\x09 From place A to place B, Party A 10 hour, Party B 8 hours, and Party B is 25% faster than Party A. ()
82.\x09 102 Grade 6 students took the graduation examination and all passed, with a passing rate of 102%. ()
83.\x09 Class Six (1) students did a math problem, 40 were right and 4 were wrong, and the error rate of solving this problem was 10%. ()
84.\x09 Donated to the disaster area, with 54 people in 6 classes (1), and the donation rate was 100%. 54 people in this class donated money. ()
85.\x09 Military families participate in "Ordinary Family Property Insurance" with the insured amount of 30,000 yuan, calculated at the insurance rate of 0.2% per year. After three years of insurance, the premium is 180 yuan. ()
86. The sum of all prime numbers in 86.\ x09 10/0 is still a prime number. ()
87.\x09 All odd numbers are prime numbers and all even numbers are composite numbers. ()
88.\x09 The product of two prime numbers must be a composite number. ()
89.\x09 Natural numbers can be prime numbers or composite numbers. ()
90.\x09 The composite number is divisible by 2. ()
9 1.\x09 A composite number has at least three divisors. ()
92.\x09 The sum of three natural numbers must be less than their product. ()
93.\x09 Because A \ b = 7, A can be divisible by B. ()
94.\x09 The divisor and multiple of a number are sometimes equal. ()
95.\x09 The least common multiple of two numbers must be the multiple of their greatest common divisor. ()
96.\x09 in a \ b = c, if a is divisible by b, then a is a multiple of b and also a multiple of c. ()
97.\x09 A number is a multiple of b number, and b number is the greatest common divisor of a number. ()
98.\x09 decompose 90 into 90=2×5×9. ()
99.\x09 Two numbers whose divisor is 1 are called prime numbers. ()
100.\x09 The prime number has only 1 divisor. ()
10 1.\x09 A prime number and any natural number less than it are prime numbers. ()
102.\x09 The common divisor has only 1 two different numbers and must be prime numbers. ()
103.\x09 If the product of two numbers is their least common multiple, then these two numbers must be prime numbers. ()
104.\x09 If a and b are different prime numbers, then a and b must be prime numbers. ()
105.\x09 Two numbers are prime numbers, which are not necessarily prime numbers. ()
106.\x09 The number that contains the divisor 2 and is divisible by 3 must be a multiple of 6. ()
107.\x09 The sum of the upper and lower bottoms of a trapezoid is certain, and its height is proportional to its area. ()
108.\x09 The area of one side of a cube is directly proportional to its surface area. ()
109.\x09 The former term of the ratio is definite, and the latter term is inversely proportional to the ratio. ()
1 10.\x09 It takes Xiaoying 10 minutes, Xiaoming 8 minutes, and the speed ratio of Xiaoying and Xiaoming is 4: 5. ()
111.\ x091.4: 2 can be proportional to 7: 10. ()
1 12.\x09 If 3a = 4b and neither a nor b is zero, then a: b = 3: 4. ()
1 13.\x09 In proportion, if the product of the two numbers that make up the inner term is 1, then the two numbers that make up the outer term are reciprocal. ()
1 14.\x09 To clearly show the altitude of Wuyue Mountain, you can draw a histogram. ()
1 15.\x09 On the map, the 6 cm line segment represents the actual distance of 6 kilometers, and the scale of this map is 1: 100000. ()
1 16.\x09 The longer the side, the bigger the angle. ()
1 17.\x09 The obtuse angle must be greater than the right angle. ()
A trapezoid has an axis of symmetry. ()
1 19.\x09 The figure on the right is a graph with four equal circles close together, and it has four symmetry axes. ()
120.\x09 For every 6m increase in the length and width of a rectangle, the area will increase by 36m. ()
12 1.\x09 The three angles of an isosceles triangle must be 45, 45 and 90. ()
122.\x09 Divide an equilateral triangle into three triangles, and the sum of the internal angles of these three triangles is 540 degrees. ()
123.\x09 At least two angles in the triangle are acute. ()
124.\x09 An isosceles triangle can be cut along the height of its base and divided into two equal right triangles. ()
125.\x09 Four sides of a parallelogram, each of which can be the base. ()
126.\x09 If the base and height of a triangle and a parallelogram are equal, the area of the triangle is half that of the parallelogram. ()
127.\x09 If two opposite sides of a parallelogram are equal to two opposite sides of a rectangle, their areas are also equal. ()
128.\x09 Two trapezoids with the same area can be combined into a parallelogram. ()
129.\x09 Two identical isosceles trapezoid can be combined into a parallelogram. ()
130.\x09 All circles have equal pi. ()
13 1.\x09 The line segment passing through the center of the circle is called the diameter. ()
132.\x09 The area of a circle is directly proportional to its radius. ()
133.\x09 When the side length of a cube is doubled, its volume is also doubled. ()
134.\x09 The bottom area of a cuboid is 10 square decimeter, the height is 7 cm, and the volume is 7 cubic decimeter. ()
135.\x09 Tie a cross packing rope on both sides of the rectangular commodity packing box, and the length of the packing rope should be at least the sum of the sides of the box. ()
136.\x09 The radius of the bottom surface of the cylinder is r, the height is h, and its surface area is expressed by letters as 2π(h+r). ()
137.\x09 The radius of the bottom surface of the cylinder is enlarged twice, the height is also enlarged twice, and the area of the side surface is enlarged four times. ()
138.\x09 A cylinder is 2 meters long. After being divided into two equal sections, the surface area is increased by 6.28 square decimeter, so the volume of each section is 3 1.4 cubic decimeter. ()
139.\x09 The height of a cylinder and a cone is equal, and the difference between their volumes is 6.28 cubic centimeters, so the sum of their volumes is 12.56 cubic centimeters. ()
140.\x09 Any prime plus 1 is not necessarily an even number. ()
14 1.\x09 Two prime numbers must be prime numbers. ()
142.\x09 All composite numbers can be expressed by multiplying prime numbers. ()
143.\x09 The original number is reduced by 20%. Get a new number, the original number is 20% more than the new number. ()
144.\x09 Any circle has countless axes of symmetry. ()
145.\x09 Two lines that do not intersect are called parallel lines. ()
146.\x09 The product of any natural number multiplied by 2 must be a composite number. ()
147.\x09 The area of a parallelogram is equal to twice the area of a triangle. ()
148.\x09 1 divided by any natural number is equal to its reciprocal. ()
149.\x09 The numerator of a false fraction must be greater than its denominator. ()
150.\x09 Because 3x=5y and x∶y=5∶3. ()
15 1.\x09 Two sectors with equal central angles have the same area. ()
152.\x09 The side length of a square is equal to the radius of a circle, so the ratio of the square area to the circle area is 1: π. ()
153.\x09 In proportion, if the product of two outer terms is 1, then the two inner terms must be reciprocal. ()
154.\x096.444 is a cyclic decimal. ()
155.\x09 The minimum prime number is the greatest common divisor of all even numbers in a natural number. ()
156.\x09 An equilateral triangle must be an acute triangle. ()
157.\x09A×B= 1, then the numbers a and b are reversed ().
158.\x09 The least common multiple of any two different natural numbers is greater than any one of them. ()
159. The number of boys in this class is 5% more than that of girls. Then there are 5% fewer girls than boys in the class. ()