解方程0.2x-0.7=0.3(x-3)
问题描述:
解方程0.2x-0.7=0.3(x-3)
答
0.2x-0.7=0.3x-0.9
0.2x-0.7-0.3x+0.9=0
-0.1x+0.2=0
-0.1x=-0.2
x=2