高阶因式分解2x²+xy-y²-4x+5y-6.
3个回答

2x^2+xy-y^2-4x+5y-6

=(2x-y)(x+y)-4x+5y-6

=(2x-y)(x+y)+(2x+2y)-6x+3y-6

=(2x-y)(x+y)+2(x+y)-6x+3y-6

=(x+y)(2x-y+2)-3(2x-y+2)

=(x+y-3)(2x-y+2)

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