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.

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