用分组分解法 5x^2+6y-15x-2xy x^3+9+3x^2+3x 2x^2+xy-y^2-4x+5y-6
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/12 20:18:37
用分组分解法 5x^2+6y-15x-2xy x^3+9+3x^2+3x 2x^2+xy-y^2-4x+5y-6
5x^2+6y-15x-2xy
=(5x²-15x)+(6y-2xy)
=5x(x-3)+2y(3-x)
=(5x-2y)(x-3)
x^3+9+3x^2+3x
=(x³+3x²)+(3x+9)
=x²(x+3) +3(x+3)
=(x²+3)(x+3)
2x^2+xy-y^2-4x+5y-6
这道题可以先分开来看
先分成2x²-4x-6 - y²+5y-6
=(2x-6)(x+1) =-(y²-5y+6)
=(y-2)(y-3)
显然无法合并
所以嘛,你打错了吧
=(5x²-15x)+(6y-2xy)
=5x(x-3)+2y(3-x)
=(5x-2y)(x-3)
x^3+9+3x^2+3x
=(x³+3x²)+(3x+9)
=x²(x+3) +3(x+3)
=(x²+3)(x+3)
2x^2+xy-y^2-4x+5y-6
这道题可以先分开来看
先分成2x²-4x-6 - y²+5y-6
=(2x-6)(x+1) =-(y²-5y+6)
=(y-2)(y-3)
显然无法合并
所以嘛,你打错了吧
用分组分解法 5x^2+6y-15x-2xy x^3+9+3x^2+3x 2x^2+xy-y^2-4x+5y-6
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