50x=40(x+2-0.一步步写下来.
问题描述:
50x=40(x+2-0.一步步写下来.
答
50x=40(x+2-0.5)
50x=40x+40*2-0.5*40
50x=40x+80-20
50x=40x+60
50x-40x=60
10x=60
x=60/10
x=6