[0.85X-(x-45)]*8=120,问X等于多少?
问题描述:
[0.85X-(x-45)]*8=120,问X等于多少?
答
[0.85X-(x-45)]*8=120
0.85X-(x-45)=15
0.85x-x+45=15
x-0.85x=45-15
0.15x=30
x=200