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Report the sixth grade problem of primary school mathematics and ask for help urgently.
Reward score: 0- 14 days. The question ended 23 hours ago.
Supplementary question: 1. Fill it in.
1, divide the 6-meter-long line segment into 5 segments on average, and each segment accounts for () of the total length.
.
2.0. 15: The simplest integer ratio is (), and the ratio is ().
3. The circumference and radius of a circle are directly proportional to ().
4. Divide a circle into 16 equally and make it into an approximate rectangle. The circumference of a rectangle is 8 cm longer than the original circle, and the area of the original circle is () square centimeters.
2. True or false: 10%
1, a number divided by the true fraction, the quotient must be greater than this number. ………………( )
2. The sector has only one axis of symmetry. ……………………………………( )
3. The circumference of a big circle is twice that of a small circle, and the ratio of the area of the big circle to the area of the small circle is.
2: 1……………………………………………………… ( )
The number of subscriptions to Little Weekly is directly proportional to the amount of money. ………………( )
5. In a proportion, two internal terms are reciprocal, one is an external term and the other is an external term. …………………………………………………( )
Questioner: Millennium Glacier-1
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Answer *** 4
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Interviewee: Xiao Li lpq- Level 1 2010-1-1817: 59.
Report 1. Fill in the blanks. (10)
The meaning of fractional division of (1) is the same as that of integer division, which is the operation of finding the other () by knowing two () and one ().
(2)0.3× 12 means (), and 12×0.3 means ().
(3) If an equation has two levels of operation, do () first, and then do ().
(4) 0.0 1376376 ... is a decimal (), its cycle segment is (), which can be abbreviated as (), and the three decimal places are about ().
(5) When two numbers are divided, the quotient is 3.5. If the dividend is enlarged by 5 times, the quotient () remains unchanged.
(6)7.5÷0.0 15=( )÷ 15。
?
(7) Of the four numbers of 4.73, 4.73, 4.737 and 4.7, the largest number is () and the smallest number is ().
(8)3 hours and 42 minutes = () 1.5 hours = () hours and () minutes.
(9 9) 100 kg of peanuts can squeeze out 38 kg of oil. According to this calculation, one kilogram of peanut can extract () kilograms of oil, and it takes about () kilograms of peanuts to extract 1 kilogram of oil.
(10)5 divided by the sum of 1.2 and 2.8, the quotient is (); 5 divided by 1.2 plus 2.8, and the sum is ().
Second, the judgment question. (6 points)
(1) 1.72×0.5 means 0.5 1.72. What is it? ( )
(2) Add "0" after the decimal point or remove the decimal number "0". ( )
(3) The quotient of 78.6 ÷ 0.847 is greater than the dividend. ( )
(4) When seeking the approximate value of quotient, if you want to keep three decimal places, you should divide by thousands. ( )
(5) Fractional division has the same meaning as integer division. ( )
Third, multiple choice questions. (6 points)
The quotient of (1)28÷ 1 1 is ().
1 pure cyclic decimal 2 mixed cyclic decimal 3 finite decimal
(2) The number A is 0. 1, the number B is 0.0 1, and the product of the number A and the number B is ().
○ 10. 1 ○20.0 1 ○30.00 1 ○40.000 1
(3) The following formula with the result greater than 1 is ().
○ 12÷2.02 ○2 1÷0.7 ○30.8 1×0.8 1
(4)8.4÷ 1.2÷5 The simplest method is ().
○ 1(8.4÷ 1.2)÷5 ○28.4÷( 1.2÷5) ○38.4÷( 1.2×5)
(5) What is the product of 6.4 divided by 2. 1 and 0.5 multiplied by 1.8? The correct formula is ().
○ 16.4÷2. 1-0.5× 1.8 ○26.4÷(2. 1-0.5)× 1.8 ○36.4÷(2. 1+0.5)× 1.8
(6) The distance between the two places is 620 meters. Party A and Party B move in opposite directions at the same time. Party A walks 80 meters per minute and Party B walks 75 meters per minute.
How many minutes do two people meet? The correct formula is ().
○ 1620÷(80+75) ○2620÷80÷75 ○3620÷(80-75)
Verb (abbreviation of verb) calculation problem
A) write the number directly. (6 points)
○ 1 12.7+ 1.08= ○2 1.92-0.53 = ○33.07×0.2=
○4 1.2÷0.04 = ○52.5×0.5÷2.5×0.5 = ○60.42×5=
B) Find the unknown x. (8 points)
○ 1x+3.04 = 8.2○2 14. 14-x = 5.27○36.4×x = 96○4x÷0.06 = 0.28
C) Calculate by a simple method. (12)
○ 1 10.27×2.4- 10.27+ 10.27×7.6 ○23.57+ 1.9+6.43+6. 1
○398.2× 10 1-98.2 ○40. 125×32×0.5
D), parting calculation. (16)
○ 14.32× 15÷ 12+5. 1÷0.85 ○220. 148-0.8×( 10.4+0.64)÷0.92
○3 13-[3.8+(24-25×0.6)] ○4(3.4-2.8)×(6.25÷2.5+0.25)
Six, column calculation. (9 points)
What is the product of the difference between (1)3.5 and 2. 1 multiplied by the sum of 1.7 and 0.8?
(2) How much is the quotient of 0.9 divided by 4.68 less than the product of 6.4 multiplied by 1.2?
(3) What is the quotient of17 minus the product of 3.24 and 2.65 and minus 12.42?
Seven, application questions. (1-3, 5 points for each question, 6 points for questions 4 and 5, and 27 points for * * *).
(1) Xiao Qiang's family used 78.6 degrees of water last month, and the water fee 1.43 yuan. Xiao Qiang is a family of five. How much was the water fee for each person last month?
(3) Build a 5.6 km road, 0.6 km in the first 4 days and 0.8 km in the rest, which will be used after the road is completed.
How many days did it take?
(4) The distance between Station A and bilibili is1200km. A bus and a truck leave from Station A and bilibili relatively, and the bus runs every hour.
85 kilometers, the truck is driving at 65 kilometers per hour. How many hours later, two cars met? How many kilometers did the passengers walk when they met the truck?
(5) Xia 'nan Primary School used 695.8 kWh of electricity in September, saving 20.8 kWh in1October compared with September.
How many kilowatt hours do you use for two months?
(2) Mom bought 4 kilograms of tribute pears and 3 kilograms of apples, and * * * paid 8. 15 yuan, that is, per kilogram of tribute pears 1.25 yuan, one kilogram more than apples.
Less yuan?
Interviewee: Lonely defeated dx- Level 4 2010-1-1818: 06.
Report 65438+0.6 tons per hectare in 2005, 0.4 tons per hectare in 2006, how many tons per hectare in 2006? What percentage has the output increased?
In 2005, the output per hectare was 1.6 tons, which increased by 0.4 tons in 2006. What is the output per hectare in 2006?
1.6+0.4 = 2 (ton)
What percentage has the output increased?
0.4÷ 1.6=25%
In 2005, the output per hectare was 1.6 tons, which increased by 0.4 tons in 2006. What is the output per hectare in 2006?
1.6+0.4 = 2 (ton)
What percentage has the output increased?
0.4÷ 1.6=25%
In 2005, the output per hectare was 1.6 tons, which increased by 0.4 tons in 2006. What is the output per hectare in 2006?
1.6+0.4 = 2 (ton)
What percentage has the output increased?
0.4÷ 1.6=25%
2. After a cylinder is cut into the largest cuboid, its volume decreases by 1 14 cubic centimeter. What is the original volume of this cylinder? Solution: Let the radius of the bottom surface of the original cylinder be r, then the remaining surface after the bottom surface is cut into a cuboid is square and the diagonal is 2r, then the cut volume can be expressed as:
(πr2-2r×r×2÷2)h= 1 14
R2 = 100/ hour
The original cylinder volume is π r2h = 3.14×100/h× h = 314 (cubic meter).
3. The total surface area of the original cylindrical steel bar with a cross-sectional diameter of 2 cm is 75.36 cm2. Find the volume of the original steel bar .. The lateral area of the original steel bar is: 75.36-3.14× (2 ÷ 2 )× (2 ÷ 2 )× 4 = 62.8 (cm2).
The lateral area of the original steel bar is 75.36-3.14× (2 ÷ 2 )× (2 ÷ 2 )× 4 = 62.8 (square centimeter).
The original steel bar height is 62.8 (3.14× 2) =10 (cm).
The volume of the original steel bar is 3.14× (2 ÷ 2 )× (2 ÷ 2 )×10 = 31.4 (cubic centimeter).
A: It turns out that the volume of this steel bar is 3 1.4 cubic centimeter.
Interviewee: Overseas Sweetheart-Level 2 2010-1-1818: 08.
Report 65438+6/0.5
Question 2 is unclear.
Proportional
4 No ... Remember that there are teaching methods in the book.
judge
1. Error counterexample: take 0.
2. Right
mistake
4 pairs
Question 5 does not need to divide 1 by the known external term.
Responder: Final Perfect _-Level 2: 2010-1-18:10.
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