x-40%x+4=80%怎么算
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x-40%x+4=80%怎么算
x-40%x+4=80%怎么算
x-40%x+4=80%怎么算
x-40%x+4=80%
x-0.4x+4=0.8x
0.2x=4
x=20
x-40%x+4=80%
100X-40X+400=80(两边同乘100)
60X=-320(移项)
X=-16/3
原式可变为x-0.4x=0.8-4
0.6x=-3.2
x=6分之32