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分解因式x^2+2xy+y^2-4x-4y-5
人气:286 ℃ 时间:2019-08-26 06:40:41
解答
x^2+2xy+y^2-4x-4y-5
=(x+y)²-4(x+y)-5
=(x+y)²-4(x+y)+4-9
=(x+y-2)²-9
=(x+y-2)²-3²
=(x+y-5)(x+y+1)
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