Current location - Training Enrollment Network - Mathematics courses - How to solve the problem of people's education on page 72 of the fifth grade math book
How to solve the problem of people's education on page 72 of the fifth grade math book
4. Solution: Let each X element.

(6+9)x= 1.5

15x÷ 15 = 1.5÷ 15

x=0. 1

5. 13.2 x+9x = 33.3 8x-3x = 105

22.2 x÷22.2 = 33.3÷22.2 5x÷5 = 105÷5

x= 1.5 x=2 1

5.4x+x = 12.8 x-0.36 x = 16

(5.4+ 1)x= 12..8 ( 1-0.36)x= 16

6.4÷6.4= 12.8÷6.4 0.64x÷0.64= 16÷0.64

x=2 x=25

6. Solution: Let the smaller natural number be X and the other natural number be x+ 1.

x+(x+ 1)=97

2x+ 1- 1=97- 1

2x=96

2x \2 = 96 \2

x=48

x+ 1=48+ 1=49

A: These two natural numbers are 48 and 49 respectively.

7. Solution: Suppose there are X chickens and rabbits.

2x+4x=48

x=8

A: There are 8 chickens and 8 rabbits in each group.

8. Solution: Suppose Xiaoming is X years old and his mother is 3x years old.

3x-x=24

x= 12

3x=3× 12=36

A: Xiaoming 12 years old, and his mother is 36 years old.

9. Solution: Let each set of books have X copies.

2.5x+3x=22

x=4

There are 4 books in each series.

10. Solution: It was supposed to be shipped x times in the afternoon before it was finished.

5×3+5x=35

x=4

A: It will be delivered four times in the afternoon.

Solution: Let the number in □ be X.

24x- 15x= 18

x=2

So □ should fill in 2.

12.3x=x+ 100

2x= 100

x=50