百分之30(x-1)等于百分之20(x-1)+0.2等于?
问题描述：
百分之30(x-1)等于百分之20(x-1)+0.2等于?
答
30%-20%x=x-1.8 x+0.2x=0.3+1.8 1.2x=2.1 x=2.1÷1.2 x=7/4 1
百分之30(x-1)等于百分之20(x-1)+0.2等于?
30%-20%x=x-1.8 x+0.2x=0.3+1.8 1.2x=2.1 x=2.1÷1.2 x=7/4 1