问题
解答题
解方程.
(1)40%X=120
(2)X+4X=250
(3)X-150=50%X.
答案
(1)40%X=120,
40%X÷40%=120÷40%,
x=300;
(2)X+4X=250,
5x=250,
5x÷5=250÷5,
x=50;
(3)X-150=50%X,
X-150+150=50%X+150,
x-50%x=50%x+150-50%x,
50%x=150,
50%x÷50%=150÷50%,
x=300.