x-[(5/9)x-3]+31=1.2x x=?
问题描述:
x-[(5/9)x-3]+31=1.2x x=?
答
x-[(5/9)x-3]+31=1.2x
x-5x/9+3+31=1.2x
34=0.2x+5x/9
34=34x/45
x=45