x-40%x-1/2x=13 解方程,应该是x-40%x-1/2x=1/13

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x-40%x-1/2x=13 解方程,应该是x-40%x-1/2x=1/13
x-40%x-1/2x=13 解方程,
应该是x-40%x-1/2x=1/13

x-40%x-1/2x=13 解方程,应该是x-40%x-1/2x=1/13
x-40%x-1/2x=1/13
x-2/5x-1/2x=1/13
10/10x-4/10x-5/10x=1/13
1/10x=1/13
x=1/13÷1/10
x=1/13×10
x=10/13
验算:把x=10/13代入原式得:
10/13-40%×10/13-1/2×10/13
=10/13-4/13-5/13
=1/13
(正确)
(...苦了我啊~~望采纳,谢谢)

x-0.4x-0.5x=1/13
0.1x=1/13
x=10/13
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