(x-1)+(x+2)+0.2x+2x=46
问题描述:
(x-1)+(x+2)+0.2x+2x=46
答
(x-1)+(x+2)+0.2x+2x=46
x-1+x+2+0.2x+2x=46
4.2x=45
x=75/7不对,0.2x改成0.5x