化简(x+y+z)²-(x+y-z)²的结果是
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解决时间 2021-02-04 03:21
- 提问者网友:眉目添风霜
- 2021-02-03 08:25
化简(x+y+z)²-(x+y-z)²的结果是
最佳答案
- 五星知识达人网友:持酒劝斜阳
- 2021-02-03 09:31
=(x+y+z+x+y-z)(x+y+z-x-y+z)
=2(x+y)*2z
=4z(x+y)
=2(x+y)*2z
=4z(x+y)
全部回答
- 1楼网友:洒脱疯子
- 2021-02-03 10:01
解:
(x+y+z)²-(-x+y+z)²+(x-y+z)²-(x+y-z)²
=[(x+y+z)²-(-x+y+z)²]+[(x-y+z)²-(x+y-z)²]
=(x+y+z-x+y+z)(x+y+z+x-y-z)+(x-y+z+x+y-z)(x-y+z-x-y+z)
=(2y+2z)×2x+2x×(2z-2y)
=2x[(2y+2z)+(2z-2y)]
=2x×4z
=8xz
选d!!!!!!!!!!!!
开始用的是平方差公式!!!
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