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原帖由 lvyy248 于 2008-10-30 23:09 发表 x²+xy-6y²+2x-14y+8 =(x+3y)(x-2y)+2x-14y+8 =(x+3y)(x-2y)+4x-8y-2x-6y+8 =(x+3y)(x-2y)+4(x-2y)-2(x+3y-4) =(x-2y)(x+3y+4)-2(x+3y-4) =(x-2y-2)(x-3y+4)