问题
解答题
解方程.
30%x=120
x+35%x=240
x-60%x=160
50%x-33%x=34
120x-20x=40
x+130%x=460.
答案
(1)30%x=120,
30%x÷30%=120÷30%,
x=400;
(2)x+35%x=240,
1.35x=240,
1.35x÷1.35=240÷1.35,
x=
;4800 27
(3)30x-60%x=160,
0.4x=160,
0.4x÷0.4=160÷0.4,
x=400;
(4)50%x-33%x=34,
17%x=34,
17%x÷17%=34÷17%,
x=200;
(5)120x-20x=40,
100%x=40,
x=40;
(6)x+130% x=460,
2.3x=460,
2.3x÷2.3=460÷2.3,
x=200.