Find 15 application problems and recursive calculation in the second volume of fifth grade mathematics.

1. The school library bought 480 new books, of which 3\4 were literature books. How many?

2. The school library bought 480 new books, of which 3\4 are literature books and 2\9 are story books. How many story books are there?

There are 32/kloc-0 pear trees and 400 apple trees in the orchard. These two kinds of fruit trees are equivalent to 7/8 of all fruit trees in the orchard. How many trees are there in the orchard?

4. Dad bought a big watermelon, mom ate 2/8, and peas ate 1/8. How much did they eat?

5. Class 3 (1) and Class 3 (2) water all the young trees in the school. Class 3 (1) poured 3/9. How much did Class 3 (2) pour?

6. A bag of melon seeds weighs1/4kg, which is 2/4kg lighter than a bag of sugar. How much does a bag of melon seeds and a bag of sugar weigh?

7. The ratio of the bottom areas of the two cylindrical containers A and B is 4: 3. The water depth of container A is 4 cm more than that of container B, and then the same amount of water is injected into both containers, which is exactly 25 cm. How many centimeters is the water depth in the original container A?

8. 720 students took part in planting trees. It is known that the ratio of grade six to grade five is 3: 2, and grade six is 80 more than grade four. How many people participated in tree planting in each of the three grades?

9. The ratio of the bottom areas of the two cylindrical containers A and B is 4: 3. The water depth of container A is 4 cm more than that of container B, and then the same amount of water is injected into both containers, which is exactly 25 cm. How many centimeters is the water depth in the original container A?

10. There are four production teams in the first workshop. One or two teams *** 19 people, two, three and four teams ***35 people. It is known that the number of the second team accounts for the total number of the four production teams. How many people are there in the first workshop

1 1. The school interest classes are divided into two groups. After one-third of the students were transferred from group A to group B, one-fifth of the students in group B were transferred to group A. At this time, there were 24 students in both groups. How many students are there in each group?

12, 4/5 of the number of boys in a class plus the number of girls is exactly 49; Four fifths of the girls plus the boys are 50. How many students are there in this class?

13. A loom weaves half a meter in two minutes. How many meters do you weave per minute on average?

14. There are 36 people reading books in the school library, and girls account for 4/5 of the boys. Later, several girls came. Now the number of girls accounts for 3/4 of the total number. Then some girls came.

15, RMB 2,000 each for Party A and Party B * * *. Party A gives Party B half, and then Party B gives Party A its own 1/3, and then Party A gives Party B its own 1/4. At this time, Party B has more money than Party A. 650 yuan, how much do they have first?

16, a factory * * has workers 1300 people. If we transfer 1/8 male employees and recruit 500 female employees, it means that the number of male employees and female employees is equal. Q: How many people are employed in this factory?

17, a factory * * employees 120, of which female employees account for the whole factory15. Later, this factory recruited some laid-off women workers, accounting for 1/4 of the whole factory. How many employees are there in this factory? How many new employees are recruited?

Off-scale calculation: 1: 1. 3/7 × 49/9-4/3

2.8/9 × 15/36 + 1/27

3. 12× 5/6 – 2/9 ×3

4.8× 5/4 + 1/4

5.6÷ 3/8 – 3/8 ÷6

6.4/7 × 5/9 + 3/7 × 5/9

7.5/2 -( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

1 1.7 × 5/49 + 3/ 14

12.6 ×( 1/2 + 2/3 )