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因式分解x^2-2xy-8y^2
人气:467 ℃ 时间:2020-03-22 12:42:15
解答
x^2-2xy-8y^2=x^2-2xy+y^2-9y^2=(x-y)^2-(3y)^2=(x-y+3y)(x-y-3y)=(x+2y)(x-4y)
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