因式分解x^2+xy-2y^2
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因式分解x^2+xy-2y^2
原式=x^2-y^2-(xy+y^2)
=(x+y)(x-y)-y(x+y)
=(x+y)(x-2y)
(x+2y)(x-y)
(x+2y)(x-y)
因式分解x^2+xy-2y^2
原式=x^2-y^2-(xy+y^2)
=(x+y)(x-y)-y(x+y)
=(x+y)(x-2y)
(x+2y)(x-y)
(x+2y)(x-y)