因式分解x^2+xy-2y^2

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因式分解x^2+xy-2y^2因式分解x^2+xy-2y^2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)

因式分解x^2+xy-2y^2
因式分解x^2+xy-2y^2

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)