25%x+5/2x+21=x怎么解

问题描述:

25%x+5/2x+21=x
怎么解

25%x+5/2x+21=x
0.25x+2.5x+21=x
(0.25+2.5-1)x=-21
1.75x=-21
x=-21/1.75=-12

25%x+5/2x+21=x
0.25x+2.5x+21=x
1.75x=-21
x=-12
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25%x+5/2x+21=x 每一项都乘4
x+10x+84=4x
x+10x-4x = -84
7x= -84
x=-12

(0.5+2.5-1)x=-21
2x=-21
x=-21/2=-10.5

5/2 是5分之2吗?假如是那么
25%x+5/2x+21=x
0.4x+0.4x+21=x
x-0.4x-0.4x=21
0.2x=21
x=21/0.2
x=105

解答如下:
0.25x + 2.5x + 21 = x
移项得,1.75x = -21
x = -12

25%x+5/2x+21=x
x-0.25x-0.4x=21
0.35x=21
x=21÷0.35
x=60