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x^2-3xy-10y^2+x+9y-2

学习时间:2026-11-12 23:12:55 阅读：3160

x^2-3xy-10y^2+x+9y-2

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虚幻的路灯

2026-11-12 23:12:55

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添项、拆项,得x^2-3xy-10y^2+x+9y-2=(x+2y)(x-5y)+2x+4y-x+5y-2=(x+2y)(x-5y)+2(x+2y)-(x-5y+2)=(x+2y)(x-5y+2)-(x-5y+2)=(x+2y-1)(x-5y+2)

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辛勤的季节
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2026-11-12 23:12:55
添项、拆项,得x^2-3xy-10y^2+x+9y-2=(x+2y)(x-5y)+2x+4y-x+5y-2=(x+2y)(x-5y)+2(x+2y)-(x-5y+2)=(x+2y)(x-5y+2)-(x-5y+2)=(x+2y-1)(x-5y+2)

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