因式分解 2x^2+xy-y^2+x-5y-6
人气：354 ℃ 时间：2019-10-11 06:00:23
解答
2x^2+xy-y^2+x-5y-6
=2x^2+(y+1)x-(y^2+5y+6)
=2x^2+(y+1)x-(y+2)(y+3）
=（2x-y-3）（x+y+2）
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