(x+y+z)³+(3x-2y-3z)³-(4x-y-2z)³分解因式
分了他,
(x+y+z)³+(3x-2y-3z)³-(4x-y-2z)³分解因式
答案:1 悬赏:80 手机版
解决时间 2021-05-05 02:52
- 提问者网友:爱了却不能说
- 2021-05-04 16:42
最佳答案
- 五星知识达人网友:蓝房子
- 2021-05-04 17:44
(x+y+z)3+(3x-2y-3z)3-(4x-y-2z)3
=(4x-y-2z)[(x+y+z)^2-2(x+y+z)(3x-2y-3z)+(3x-2y-3z)^2]-(4x-y-2z)3
=(4x-y-2z)[(x+y+z)^2-2(x+y+z)(3x-2y-3z)+(3x-2y-3z)^2-(4x-y-2z)^2]
=(4x-y-2z)[(x+y+z)((x+y+z)-(3x-2y-3z))+((3x-2y-3z)-(4x-y-2z))((3x-2y-3z)+(4x-y-2z))]
=(4x-y-2z)[(x+y+z)(-2x+3y+4z)+(-x-y-z)(7x-3y-5z)]
=(4x-y-2z)(x+y+z)[(-2x+3y+4z)-(7x-3y-5z)]
=(4x-y-2z)(x+y+z)(-9x+6y+9z)
=3(4x-y-2z)(x+y+z)(-3x+2y+3z)
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