X-(0.4X+160)/0.4X+160=13/22怎么解
问题描述:
X-(0.4X+160)/0.4X+160=13/22怎么解
答
22×0.4X-22×(0.4X+160)+22×160×0.4X=13×0.4X
8.8X-8.8X-22×160+1408X=5.2X
1402.8X=3520
X=