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秃眉蛇眼的艺
2019-11-10 12:49:53
两边同乘x,得
40+5x=100,x≠0,
5x=60,
x=12,经检验,符合x≠0
40+5x=100,x≠0,
5x=60,
x=12,经检验,符合x≠0
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