1, five times a number is 1/5, and this number is (); 90 is two thirds of a number and this number is ().

2、2/7÷( )= 1/9×( )=4/5×( )= 1

3. 8/ 15 of a number is a number B, and () should be regarded as "1". If the number b is 16, the number a should be ().

4. A section of expressway, 5/8 walk, exactly 2500 meters. The unit "1" is (), 2500 corresponds to (), and the equivalent relationship is () ×5/8=2500.

A diary needs 60 pages, which is exactly 3/8 of the total pages. This diary has () pages.

6, the school has 360 story books, accounting for 2/5 of the total number of books, the whole school has books ().

7. 3/8 of a number is 9/ 10, and the correct formula for finding this number is ().

8, two-thirds of the number of basketball teams is equivalent to the number of football teams, so the number of football teams is (). (Fill in the relationship)

9. A pot of water used 3/4 kilograms, which is equivalent to 3/8 of this pot of water. How much did this pot of water weigh? Solve the equation and make this pot of water weigh x kilograms. The correct equation is ().

10, put ">" in zero. , "<, or" = "

6/7÷2〇6/7 4/ 1 1÷7/8〇4/ 1 1 3/7÷2〇3/7× 1/2

12÷4〇 12 5/7×7/8〇5/7 1/4÷ 12〇 12÷ 1/4

Second, judgment.

1, a number that is not equal to 0 divided by115, which is magnified by15 times. ( )

2. The number A divided by the number B (except 0) is equal to the reciprocal of the number A multiplied by the number B.. ( )

When a number is divided by the true fraction, the quotient must be greater than the dividend. ( )

4. The length of a wire is120m. After cutting off 1/3, there are 1 19 and 2/3 meters left. ( )

5, 6 tons 1/7 ratio 1 ton weight 6/7. ( )

Third, calculation

1/4×8/9= 3/4÷3/5= 2/3÷3/4= 32×5/8=

3/7×7/ 15= 9÷ 1/3= 16×5/8= 12÷ 1/6=

Fourth, solve the equation

5/ 14x = 5/7 3.2x = 6.4 7/ 12x = 14

4/5x = 3/ 10 x÷5/6 = 7/2 16/ 17÷x = 8

Verbs (short for verb) solve problems.

1. Wangxingdian sent back a batch of vegetables, including 120kg eggplant, of which 4/5 were tomatoes and 2/3 were cucumbers. How many kilograms of each vegetable was shipped back?

2. There are 55 trees planted in the fifth grade, accounting for 1/4 of the total trees planted in the school, and the trees planted in the sixth grade account for 2/5 of the total trees planted in the school.

How many trees have been planted in the whole school? How many trees were planted in the sixth grade?

3. 1/5 of camel's life is equivalent to 1/6 of monkey's life, and 1/3 of monkey's life is equivalent to1/0 of tortoise's life. The life of a camel is 25 years. How many years does the tortoise live?

Six, brain exercise

1, and the sum of two fractions with different denominators whose denominator is not greater than 24 is1112. How many pairs of simplest scores are there?

2. There are four numbers, and the sum of every three numbers is 22, 20, 17, 25 respectively. How do you find these four numbers?