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数学
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3a(x-y)-(y-x) 因式分解
人气:229 ℃ 时间:2019-10-11 08:21:58
解答
将-(y-x)变成+(x-y),因式3a(x-y)-(y-x)=3a(x-y)+(x-y)=(3a+1)(x-y)
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