问题标题:
求2道数学因式分解题.2x²+xy-y²-4x+5y-65+7x-6x²
问题描述:

求2道数学因式分解题.

2x²+xy-y²-4x+5y-6

5+7x-6x²

涂新斌回答:
  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)   5+7x-6x²=(5-3x)(1+2x)
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