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数学
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因式分解 -x²+2xy+y²
如题
人气:110 ℃ 时间:2019-10-29 14:25:08
解答
-(x^2-2xy+y^2)+2y^2
=-(x-y)^2+2y^2
=2y^2-(x-y)^2
=(√2y-x+y)(√2y+x-y)
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