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因式分解x^2-y^2-2-2y+1-2x
人气:212 ℃ 时间:2020-01-27 23:54:44
解答
原式=x^2-2x+1+(-y^2-2y-1)-1
=(x-1)^2-(y+1)^2-1
=(x-1-y-1)(x-1+y+1)-1
=(x-y-2)(x+y)-1
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