解方程. 1.56x+3.16=7.84 1.6x+2x×0.7=18 3x-75=64.5 (x-3)÷4=7.2 0.7×3-0.3x=0.06 x÷9=7.5.

问题描述:

解方程.
1.56x+3.16=7.84    
1.6x+2x×0.7=18     3x-75=64.5
(x-3)÷4=7.2     0.7×3-0.3x=0.06     x÷9=7.5.

(1)1.56x+3.16=7.84       1.56x+3.16-3.16=7.84-3.16             1.56x=4.68     &nbsp...