First, write directly. (5 points)
2/5× 1/6= 3/4÷3= 1/6× 12= 2/9 ÷2/3= 1/3+3/4=
3/8×2/3= 7/ 12÷7/4= 5÷5/8= 5/6 -2/3= 2/39× 13/6=
Second, solve the equation. (6 points)
1/5+2X = 1/3 X-5/8X = 3/2
Third, the calculation of the following problems can be simplified. (24 points)
2/9 + 1/4× 2/3 ( 1/6+ 1/8)×24× 1/7
5/ 12÷ 1/3-3/8× 4/9 (8/ 15+9/20×2/3)÷ 1/ 12
3/20× 10 1-3/20 9/8÷[3/4-(23/ 16-7/8)]
Fill in the blanks. (14)
1 .250ml is equivalent to1liter of ()/().
2.5/6 hours = () minutes 1250m = ()/ () kilometers.
3.() 12kg or more; 12kg is greater than () kg.
4. Cut the 20 cm long wire into five sections on average, each section is the ()/() of this wire, and each section is () decimeter long.
5. The class size is 7/ 15, and the simplest integer ratio between boys and girls is (): ().
6. "I bought a bag of rice and ate 3/8", and took () as the unit "1". There are () bags left in this bag of rice.
7. Processing a batch of parts takes only 2/7 in three days and can be completed in ()/() days every day 1/3.
8. After cutting the largest square from a rectangular piece of paper, there is 5 cm left on the edge of the original rectangle, and the remaining area is 30 cm 2. The area of the cut square is ()/() times that of the original rectangle.
9. As we all know, in an isosceles triangle, the degree of one internal angle is 1/4 of the degree of the other internal angle, so the vertex angle.
It's () degrees.
Verb (abbreviation for verb) is true or false. (Please tick "√" in brackets for the right, and "×" for the wrong) (4 points)
1.a÷5/7=a÷5×7 .……………………………………………………… ( )
2. 12÷(3/4+4/5)= 12÷3/4+ 12÷4/5= 12×4/3+ 12×5/4=3 1。 ………… ( )
3.A is more than B 1/8, that is to say, B is less than A1/8 ........................................ ()
4. 10g salt is put into 10g water, and the salt accounts for11/of salt water. ………………………… ( )
Sixth, multiple choice questions. (Please put the serial number of the correct answer in brackets) (4 points)
1. Arrive from place A to place B, with car A driving for 4 hours 1/5 and car B driving for 5 hours 1/4. Compared with the speed of the two cars, ().
(1) A car is fast (2) B car is fast (3) as fast (4) uncertain.
2. As shown in the figure, the shadow area accounts for () of the parallelogram area.
( 1)2/3 (2) 1/3 (3) 1/6 (4)5/8
3. A barrel of oil is 8kg, with 1/4kg. How many kilograms are left? The correct formula is ()
( 1)8× 1/4 (2)8×( 1- 1/4) (3)8- 1/4 (4) 1- 1/4
4. the number a is a, which is smaller than the number b, and the formula for representing the number b is ().
( 1)a×3/2-b (2)a÷3/2-b
(3)(a-b)÷ 3/2 (4)(a+b)÷3/2
Seven, column calculation. (8 points)
1.9/20 minus the product of 2/5 and 5/8. What is the difference?
2. 3/4 of a number is 84 larger than 1/6. What's this number?
Eight, solve the problem. (35 points)
1. A and b are 120km. Two cars, A and B, travel in opposite directions from two cities at the same time and meet after 4/5 hours. A car is 70 kilometers per hour, and B car is how many kilometers per hour?
2. A set of desk 80 yuan, in which the price of the chair is 3/5 of that of the desk. How much are these chairs and tables?
3. There are 20 tons of steel in the warehouse. For the first time, 1/5 of the total steel was used, and for the second time, 1/2 tons was used. How many tons do you need for two times?
4. The original price of a repeater is 292 yuan, and now the price of each repeater is reduced by 1/4. What is the price of each repeater now?
5. For project A, team A will do it alone 10 day, and team B will complete the project alone115 day. 1/2 of this project, how many days does it take for two teams to cooperate?
6. A furniture factory wants to produce a batch of sofas. In the first week, 64 sets were produced, and in the second week, 86 sets were produced, leaving 7/ 10 of the total sofa unfinished. What is the total number of sofas?
7. Xiaoming of 7.Obana * * * has collected several stamps, and Xiaoming is known to account for 3/7 of the total. If Xiaohua gives Xiaoming 10 stamps, the number of stamps is equal. How many stamps do Xiaoming and Xiaohua have?