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 that is 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 0.024 km per day, and it took 15 days. The rest will be completed in 10 days. 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. Thanks to improved technology, it actually produces 9.5 tons more than originally planned every day. 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 drive 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?

(9) 290 tons of goods in the warehouse should be shipped within one week. It has been shipped 100 tons three days ago. How many tons will be transported on average every day in the future to complete 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) A village and B village jointly dig a canal with a length of 1390 m, and A village digs from east to west. Digging 75 kilometers a day, digging 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 you want to arrive half an hour early, how many kilometers per hour?

(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 do you need to 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 bottom height of 27.6m and a height of 15m. Each cabbage covers an area of 1.8 square decimeter. How many 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) A construction team builds roads 0.54 km every day, which is 3 times less than that of B construction team.18 km every day. 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 her sister every day. How many pages does my sister read every day?

At the same time, two motorboats are sailing 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 each person sends 6 copies, it will be less 12 copies. How many "three good" students did you choose 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, 2500 kg each and 50 kg each. 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, Party A and Party B, set out from two places 480 kilometers apart at the same time, and the two cars 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?

(4 1) Two ships, Party A and Party B, sailed from Shanghai to Wuhan at the same time. Spaceship A travels at a speed of 24 kilometers per hour, 8. 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?

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.A and B two cars leave relatively from two places 420 kilometers apart at the same time. The speed of a car is 1. It's five times that of B car, and we met after 2 hours. Four hours. How many kilometers do cars 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. How many are Hongyang Middle School and Guangxin Primary School?

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, Xiao Fang walks 75 meters per minute, and they meet after 2 hours. Five minutes. 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) A triangular plot with an area of 60m2 and a known base of15m. How high is it?

(53) Clothing factory has produced 6500 suits 15 days, with an average of 200 suits per day. The remaining 50 sets will be produced every day. How many days will it take to complete?

(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, a pen costs twice as much as a ballpoint pen. 8 yuan. How much is a pen and a ballpoint pen?

XII. True or false questions

1. Square, rectangle, parallelogram and trapezoid are all special quadrilaterals. ( )

2. The volume of a cylinder is three times that of a cone, and the base and height of the cone must be equal. ( )

3. Proportion is the ratio of the previous paragraph to 1. ( )

4. 1 kg metal ratio 1 kg cotton weight. ( )

5.1100 and 1% are fractions with denominator of100, which have the same meaning. ( )

6. The volume of a cone is two thirds smaller than that of a cylinder. ( )

7. 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. In any cuboid, only two opposite faces are completely equal. ( )

10. Two rectangles with equal perimeters must have the same area. ( )

1 1. An object with a volume of 1 cubic decimeter must have a bottom area of 1 cubic decimeter. ( )

12. The bottom area of a cube with a volume of 1 cubic decimeter must be 1 cubic decimeter. ( )

13. Work efficiency is inversely proportional to working hours. ( )

Before 14. Increased by 10%. To keep the proportion unchanged, the latter term should be multiplied by 1. 1. ( )

15.5 kg salt is dissolved in 100 kg water, and the salt content of brine is 5%. ( )

16. If the scale is large, the actual distance is also large. ( )

17. If the perimeter of a square is equal to the perimeter of a circle, the area ratio of the square to the circle is π∶4. ( )

18. The smaller the fractional value, the smaller the decimal unit. ( )

19.7m 1/8 is as long as 8m 1/7. ( )

20. Two disjoint lines are called parallel lines. ( )

2 1. Xiao Wang processed 99 parts, 99 of which were qualified, and the qualified rate of these parts was 99%. ( )

22. Five workers process five parts in five hours, so 1 worker processes 1 part in 0 hours. ( )

23. Adding two zeros at the end of a number will enlarge the original number by 100 times. ( )

24. There are 365 days in a year. ( )

25. The area and volume of the bottom of the cylinder have tripled. ( )

26. 12/ 15 cannot be converted into a finite decimal. ( )

27. Numbers divisible by 3 must be divisible by 9. ( )

28.a, 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. The sum of two acute angles must be obtuse. ( )

30. In proportion, if two internal terms are reciprocal, then two external terms are reciprocal. ( )

3 1. The words "net content: 250 ml" are written on the "Guangming" milk packaging box, and this 250 ml refers to the volume of the packaging box. ( )

32.x+y = ky (k must be), then x and y are out of proportion. ( )

33. The same road takes 5 hours for Party A and 4 hours for Party B.. The speed ratio between Party A and Party B is 5:4. ( )

34. An angle greater than 90 is an obtuse angle. ( )

35. As long as this number is divisible by 2, it is even. ( )

36. Equations are all equations, so equations are also equations. ()

37. Because 1.5÷0.5=3, 1.5 can be divisible by 0.5. ()

38. When a number is multiplied by a decimal, the product must be less than this number. ()

39. When an integer is divided by a decimal, the quotient must be greater than the integer. ()

40. Multiplying a number by 0.05 means finding five percent of this number. ()

4 1. The area of parallelogram is larger than that of triangle. ()

42. Two trapezoids with the same shape have the same area. ()

43.3× b+5 can be written as 3+5b. ()

44.a3 must be greater than 3a. ( )

45. "0" means there is no object, so 0 is not a number. ( )

Divide any number by 0. ( )

47. Natural numbers can represent both "how much" and "what number". ( )

48. "There are three passengers living in Room Three." The two 3s in this sentence have different meanings. ( )

49. If 1÷a=b, then A and B are reciprocal. ( )

50. There is only one decimal greater than 1.4 and less than 1.6. ( )

5 1.

52. If a score is less than its reciprocal, it must be a real score. ( )

53. When a number is multiplied by a true fraction, the product is less than the multiplicand. ( )

54. Fake scores are definitely not the simplest scores. ( )

55. Fractions are smaller than integers. ( )

56. The numerator and denominator of a fraction are multiplied or divided by the same natural number at the same time, and the size of the fraction remains unchanged. ( )

57. 17.85000 ml =85 liters =85 cubic decimeters. ( )

58. The product of four zeros. 25 is 1. ( )

59. The second half of February in a normal year is nine days. ( )

60. 1996 is a leap year, and the sixth Olympic Games will be held in the United States. Therefore, the Olympic Games will be held in leap years every four years. ( )

6 1. The minute of the clock turns once, and the hour hand turns 30. ( )

Don't read all four zeros of 62.5500. ( )

63. The greater the denominator of a score, the greater the unit of the score. ( )

64. The maximum decimal counting unit is 80% smaller than the maximum number unit. ( )

65. unit of volume is larger than an area unit. ( )

66.A and B are both natural numbers. If a number ÷0.52= B number, then a number must be less than b number. ( )

67.5.327327 is a cyclic decimal. ( )

68.7.8+7.8+2.2+2.2=(7.8+2.2)×2。 ( )

69.x is 5 times 3.2 times 0.7, so find x. The column equation is 5x-3.2=0.7. ( )

70. The value of the unknown quantity that makes both sides of the equation equal is called solving the equation. ( )

71.15 ÷ 10 =1.5. It can be said that 15 is 0.5 times that of 10, so15 is/kloc-. ( )

72.4.9 Divided by 1.6 quotient 3, the remainder is 1. ( )

73 ..70% is 70%. ( )

74. 30% of1meter is 30% meter. ( )

75.0.8 and 0.800 have the same size and the same counting unit. ( )

76. Add 0 to the end of the decimal, and the size of the decimal remains the same. ( )

Add a "%"after 77.20, and the number will be reduced by 100 times. ( )

78. If the number A increases by 100%, which is exactly equal to the number B, then the original number A is twice that of the number B. ()

79. If the number of girls is less than 4% of the class, then the number of boys is more than 4% of the class. ( )

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. From A to B, A needs 10 hour, B needs 8 hours, and B is 25% faster than A. ()

82. Grade 6 102 people took the graduation examination and all passed, with a passing rate of 102%. ( )

83. Students in Class Six (1) did a math problem, and 40 students were right and 4 students were wrong. The error rate of solving this problem is 10%. ( )

84. Fifty-four people from Class Six (1) donated money to the disaster area, with a donation rate of 100%. 54 people in this class donated money. ( )

85. Xiaojun's family participated in the "Ordinary Family Property Insurance", with the insured amount of 30,000 yuan, calculated at the annual insurance rate of 0.2%. After three years of insurance, the premium is 180 yuan. ( )

86. The sum of all prime numbers within10 is still a prime number. ( )

87. All odd numbers are prime numbers and all even numbers are composite numbers. ( )

88. The product of two prime numbers must be a composite number. ( )

89. Natural numbers are either prime numbers or composite numbers. ( )

90. A composite number is divisible by 2. ( )

9 1. A composite number has at least three divisors. ( )

92. The sum of three natural numbers must be less than their product. ( )

93. Because a÷b=7, A can be divisible by B. ()

94. The divisor and multiple of a number are sometimes equal. ( )

95. The least common multiple of two numbers must be the multiple of their greatest common divisor. ( )

96. In a÷b=c, if A is divisible by B, then A is a multiple of B and also a multiple of C .. ()

97.A number is a multiple of B number, and B number is the greatest common divisor of A number. ( )

The prime factor of 98.90 decomposition is 90=2×5×9. ( )

99. Two numbers whose divisor is 1 are called prime numbers. ( )

100. The prime number is only 1 divisor. ( )

A prime number and any natural number smaller than it are prime numbers. ( )

102. The common divisor only has 1 two different numbers, which must be prime numbers. ( )

103. If the product of two numbers is their least common multiple, then these two numbers must be prime numbers. ( )

104. If A and B are different prime numbers, then A and B must be prime numbers. ( )

105. Two numbers are prime numbers, not necessarily prime numbers. ( )

106. A number that contains both divisor 2 and divisible by 3 must be a multiple of 6. ( )

107. The sum of the upper and lower bottoms of the trapezoid is certain, and its height is proportional to the area. ( )

108. The area of one side of a cube is directly proportional to its surface area. ( )

109. The former term of the ratio is definite, and the latter term is inversely proportional to the ratio. ( )

1 10. Xiaoying 10 minutes, Xiaoming comes home from school in 8 minutes. The speed ratio between Xiaoying and Xiaoming is 4: 5. ( )

111.1.4: 2 can be proportional to 7: 10. ( )

1 12. If 3a = 4b and both a and b are not zero, then a: b = 3: 4. ( )

1 13. 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. In order to clearly show the altitude of Wuyue Mountain, you can draw a histogram. ( )

1 15. On the map, the actual distance is 6 kilometers, with a line segment of 6 cm. The scale of this map is 1: 100000. ( )

1 16. The longer the sides of an angle are, the larger the angle is. ( )

1 17. The obtuse angle must be greater than the right angle. ( )

1 18. A trapezoid has an axis of symmetry. ( )

1 19. The picture on the right is a graph with four equal circles close together, and it has four symmetrical axes. ( )

120. If the length and width of a rectangle increase by 6 meters, the area will increase by 36 square meters. ( )

12 1. The three angles of an isosceles triangle must be 45 degrees, 45 degrees and 90 degrees. ( )

122. Divide an equilateral triangle into three triangles, and the sum of the internal angles of these three triangles is 540 degrees. ( )

123. At least two angles in the triangle are acute. ( )

124. An isosceles triangle can be cut along the height of the bottom of the isosceles triangle and divided into two equal right triangles. ( )

125. Four sides of a parallelogram, each of which can be used as the base. ( )

126. If the base and height of triangle and parallelogram are equal, the area of triangle is half that of parallelogram. ( )

127. If two groups of opposite sides of a parallelogram are equal to two groups of opposite sides of a rectangle, their areas are equal. ( )

128. Two trapezoids with the same area can be combined into a parallelogram. ( )

129. Two identical isosceles trapezoid can be combined into a parallelogram. ( )

130. All circles have equal pi. ( )

13 1. The line passing through the center of the circle is called the diameter. ( )

132. The area of a circle is directly proportional to its radius. ( )

133. When the side length of a cube doubles, its volume also doubles. ( )

134. The bottom area of a cuboid is 10 square decimeter, the height is 7 cm, and the volume is 7 cubic decimeter. ( )

135. 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 carton. ( )

136. The radius of the bottom surface of the cylinder is r, the height is h, and the surface area expressed by letters is 2π(h+r). ( )

137. The radius of the bottom surface of the cylinder is enlarged by 2 times, the height is also enlarged by 2 times, and the side area is enlarged by 4 times. ( )

138. 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. The cylinder and the cone have the same height, and the volume difference is 6.28 cubic centimeters, so the sum of their volumes is 12.56 cubic centimeters. ( )

140. Any prime plus 1 is not necessarily an even number. ( )

14 1. Two coprime numbers must be prime numbers. ( )

142. All composite numbers can be expressed by multiplying prime numbers. ( )

143. The original quantity was reduced by 20%. Get a new number, the original number is 20% more than the new number. ( )

144. Any circle has countless axes of symmetry. ( )

145. Two disjoint straight lines are called parallel lines. ( )

146. The product of any natural number multiplied by 2 must be a composite number. ( )

147. The area of parallelogram is equal to twice the area of triangle. ( )

148. 1 divided by any natural number is equal to the reciprocal of this natural number. ( )

149. The numerator of a false fraction must be greater than its denominator. ( )

150. Because 3x=5y and x∶y=5∶3. ( )

15 1. The areas of two sectors with equal central angles are equal. ( )

152. The side length of a square is equal to the radius of a circle, so the ratio of square area to circle area is 1: π. ( )

153. In proportion, if the product of two outer terms is 1, then the two inner terms must be reciprocal. ( )

154.6.444 is a cyclic decimal. ( )

155. The minimum prime number is the greatest common divisor of all even numbers in natural numbers. ( )

156. An equilateral triangle must be an acute triangle. ( )

157.A× B = 1, then the numbers a and b are reversed ().

158. The least common multiple of any two different natural numbers is greater than either of them. ( )

159. The number of boys is 5% more than that of girls. Then girls are 5% less than boys. ( )

Please give points. thank you