50%x-30=52 4.5x+3.8x=16.6 1/4:x=1/2:1/6 x/45=20%

问题描述:

50%x-30=52                                      
4.5x+3.8x=16.6

1
4
:x=
1
2
1
6
                                       
x
45
=20%

(1)50%x-30=52        0.5x-30=52     0.5x-30+30=52+30           0.5x=82   &nbsp...