分解因式:2x²+xy-y²-4x+5y-6
分解因式:2x²+xy-y²-4x+5y-6
我前面会分,后面“-4x+5y-6”就不会啦,
我前面会分,后面“-4x+5y-6”就不会啦,
数学人气:874 ℃时间:2019-10-31 01:01:48
优质解答
2x²+xy-y²-4x+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)-3(2x-y)-6=[(2x-y)(x+y)+2(x+y)]-[3(2x-y)+6]=(2x-y+2)(x+y)-3(2x-y+2)=(2x-y+2)(x+y-3)
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