2x²+xy-y²-4x+5y-6 因式分解
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2x²+xy-y²-4x+5y-6 因式分解
2x²+xy-y²-4x+5y-6 因式分解
2x²+xy-y²-4x+5y-6 因式分解
2x^2+xy-y^2-4x+5y-6
=(x+y)(2x-y)-4x+5y-6
=(x+y)(2x-y)+2(x+y)-6x+3y-6
=(x+y)(2x-y+2)-3(2x-y+2)
=(2x-y+2)(x+y-3)
用十字相乘法:原式=2x²+﹙y-4﹚x-﹙y²-5y+6﹚=2x²+[2﹙y-3﹚-﹙y-2﹚]x-﹙y-2﹚﹙y-3﹚=[2x-﹙y-2﹚][x+﹙y-3﹚]=﹙2x-y+2﹚﹙x+y-3﹚
用双十字相乘法,得(2x-y+2)(x+y-3)
H HTR GF GF
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