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因式分解-1-2x+y^2-x^2
人气:368 ℃ 时间:2020-01-30 03:11:51
解答
-1-2x+y^2-x^2
=y^2-(x^2+2x+1)
=y^2-(x+1)^2
=(y+x+1)(y-x-1)
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