x^-xy-2y^=0怎么化简成(x-2y)(x+y)=0
人气：415 ℃ 时间：2020-02-05 23:21:13
解答
∵x²-xy-2y²
=x²-xy-y²-y²
=(x²-y²)-(xy+y²)
=(x+y)(x-y)-y(x+y)
=(x+y)(x-y-y)
=(x+y)(x-2y)
∴x²-xy-2y²=0可化为(x-2y)(x+y)=0
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