2x^2+xy-y^2-4x+5y-6因式分解的答案
我不是他舅同学,对不起你的答案有误
人气:436 ℃ 时间:2019-09-27 05:47:55
解答
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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