因式分解X2+XY-2Y2+3X+3Y+2求解。谢谢(原谅2次方没法敲)
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解决时间 2021-01-27 19:26
- 提问者网友:听门外雪花风
- 2021-01-27 02:26
因式分解X2+XY-2Y2+3X+3Y+2求解。谢谢(原谅2次方没法敲)
最佳答案
- 五星知识达人网友:怙棘
- 2021-01-27 04:02
x^2+xy-2y^2+3x+3y+2
=(x+2y)(x-y)+(x+2y)+2x+y+2
=(x+2y)(x-y+1)+x-y+1+x+2y+1
=(x+2y+1)(x-y+1)+x+2y+1
=(x+2y+1)(x-y+2)
=(x+2y)(x-y)+(x+2y)+2x+y+2
=(x+2y)(x-y+1)+x-y+1+x+2y+1
=(x+2y+1)(x-y+1)+x+2y+1
=(x+2y+1)(x-y+2)
全部回答
- 1楼网友:十年萤火照君眠
- 2021-01-27 05:31
x^4 - xy^3 - x^3y - 3x^2y + 3xy^2 + y^4
=(x^4 - x^3y )- 3x^2y +3xy^2 + (y^4- xy^3)
=x^3(x-y)- 3x^2y + 3xy^2+y^3(y-x)
=x^3- 3x^2y + 3xy^2-y^3
=(x-y)^3
=1
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