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因式分解x^2(y-x)+81(z-y)
人气:169 ℃ 时间:2020-04-19 06:56:47
解答
x^2(y-x)+81(z-y)
=x^2(y-x)-81(y-x)
=(x^2-81)(y-x)
=(x-9)(x+9)(y-x)
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