Solution: 2(x-2.6)÷2=8÷2 Solution: 5 (x+1.5) ÷ 5 =17.5 ÷ 0.5.

x-2.6 =4 x+ 1.5=3.5

x-2.6+2.6 = 4+2.6 x+ 1.5- 1.5 = 3.5- 1.5

x=6.6 x=2

8(x-6.2)=4 1.6 ( x-3)÷2=7.5

Solution 8 (x-6.2) ÷ 8 = 4 1.6 ÷ 8 solution: (x-3)÷2×2=7.5×2.

x-6.2=5.2 x-3= 15

x-6.2+6.2 = 5.2+6.2 x-3+3 = 15+3

x= 1 1.4 x= 18

2. Solution: Let each child ticket be RMB 2 yuan (4+x)= 1 1.

2(4+x)÷2= 1 1÷2

4+x=5.5

4+x-4=5.5-4

x= 1.5

3. Solution: Set the room 102. The reading of this water meter is x tons.

(x-3 102)×2.5= 135

(x-3 102)×2.5÷2.5 = 135÷2.5

x-3 102=54

x-3 102+3 102 = 54+3 102

x=3 156

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

Solution: 22.2x÷22.2=33.3÷22.2 Solution: 5x÷5 = 105÷5.

x= 1.5 x=2 1

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

Solution: (5.4+ 1) x = 12.8 solution: (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