解方程. 9(x+2.7)=75.6 4.07x一2.57x=2.25 5x+1.3×0.6=21.48.

问题描述:

解方程.
9(x+2.7)=75.6
4.07x一2.57x=2.25
5x+1.3×0.6=21.48.

(1)9(x+2.7)=75.6,      9(x+2.7)÷9=75.6÷9,              x+2.7=8.4,     &nbs...