x²-xy+3y-3x
=x(x-y)-3(x-y)
=(x-y)(x-3)
2x²+xy-y²-4x+5y-6
=(2x-y)(x+y)-4x+5y-6
=(2x-y+2)(x+y-3)
因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6
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