Question

解方程或解比例

2

3

x+

1

2

x=42                     

x

2.4

=

15

0.8

．

Answer 1

（1）

2

3

x+

1

2

x=42                                 （2）

x

2.4

=

15

0.8

      

7

6

x=42                                            0.8x=2.4×15
        x=42÷

7

6

                                         0.8x=36
        x=36；                                               x=45；