
展开全部
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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