(x-100)×(1-60%﹚=1/5x 怎么解
问题描述:
(x-100)×(1-60%﹚=1/5x 怎么解
答
(x-100)×(1-60%﹚=1/5x
0.4(x-100)=0.2x
0.4x-40=0.2x
0.4x-0.2x=40
0.2x=40
x=200