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x-(1/4x-20)=5(1/4x-20)
人气:430 ℃ 时间:2020-05-11 11:29:42
解答
x-1/4x+20=5/4x-5*20
5/4x-x+1/4x=20+5*20
1/2x=120
x=120÷1/2
x=240
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