2、X- 1 12 = 988 3x = 480 X = 6.4 = 7.3

3 、( 1)x=56

(2) x=5

4、X=29 x= 136 x=0 x=6.8

(Inspection omitted)

5.X- 1 16=84 solution: x=84+ 1 16 x=200.

X+3.5=6 Solution: x=6-3.5 x=2.5.

6、x=8 x=560 x=0.2 x= 12.5

(Inspection omitted)

7、4x=36 x=9

18x=450 x=25

8、X= 13.3 x=2.7 x= 15

x=8 10 x=72 x=0.4

9 、( 1)>

(2)=

(3)& lt；

10、 1.6x=5.6 x=3.5

4x= 10 x=2.5

1 1、 12x=3 1.2 x=2.6

9.6y=48 y=45

12、4x=72 x= 18

200+x=450 x=250

13, the price of an exercise book is equal to the price of five pencils.

Textbook 9 pages? Practice?

The weight of African elephants? 33= weight of blue whale

Solution: Suppose this African elephant weighs about X tons.

33x= 165 x=5