x-60 / 100 =100=40/100x=100x=100*100/40 (除以一个数,等于乘以这个数的倒数)X=10000/40x=250
合并同类项(1-60%)x=100(1-0.6)x=1000.4x=100两边同时除以0.4,得x=250
(1-60%)x=1000.4x=100x=100÷0.4x=250