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x^2-xy-2y^2-x-y=?.
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x²-xy-2y²-x-y
=（x²-y²）-(xy+y²)-(x+y)
=(x-y)(x+y)-y(x+y)-(x+y)
=(x-y-y-1)(x+y)-(x+y)---------------------------提取公因式（x+y）
=(x-2y-1)(x+y)
=（x²-y²）-(xy+y²)-(x+y)
=(x-y)(x+y)-y(x+y)-(x+y)
=(x-y-y-1)(x+y)-(x+y)---------------------------提取公因式（x+y）
=(x-2y-1)(x+y)
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