x^2-4xy+3y^2-6y-9
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解决时间 2021-01-07 21:09
- 提问者网友：雨不眠的下
- 2021-01-07 17:35
x^2-4xy+3y^2-6y-9
最佳答案
- 五星知识达人网友：孤独入客枕
- 2021-01-07 19:02
x²-4xy+3y²-6y-9
=(x²-4xy+4y²)-(y²+6y+9)
=(x-2y)²-(y+3)²
=[(x-2y)+(y+3)][(x-2y)-(y+3)]
=(x-y+3)(x-3y-3)
=(x²-4xy+4y²)-(y²+6y+9)
=(x-2y)²-(y+3)²
=[(x-2y)+(y+3)][(x-2y)-(y+3)]
=(x-y+3)(x-3y-3)
全部回答
- 1楼网友：从此江山别
- 2021-01-07 20:22
x^2-4xy+3y^2-6y-9
=(x^2-4xy+4y^2)-(y^2+6y+9)
=(x-2y)^2-(y+3)^2
=(x-2y+y+3)(x-2y-y-3)
=(x-y+3)(x-3y-3)
=(x^2-4xy+4y^2)-(y^2+6y+9)
=(x-2y)^2-(y+3)^2
=(x-2y+y+3)(x-2y-y-3)
=(x-y+3)(x-3y-3)
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