问题标题:
因式分解:x×x-xy-2y×y-x-y
问题描述:
因式分解:x×x-xy-2y×y-x-y
钱涓回答:
(x+y)(x-y)-x(y+1)-y(y+1)
=(x+y)(x-y)-(x+y)(y+1)
=(x+y)(x-2y-1)
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