(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详细计算过程
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(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详细计算过程
你好
(x-2y-z)(x-2y+z)-(x+2y+z)^2
=[(x-2y)-z][(x-2y)+z]-[(x+2y)+z]²
=(x-2y)²-z²-[(x+2y)²+2(x+2y)z+z²]
=(x-2y)²-(x+2y)²-2(x+2y)z
=4*x*2y-2xz-4yz
=8xy-2xz-4yz
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(x-2y-z)(x-2y+z)-(x+2y+z)^2
=[(x-2y)-z][(x-2y)+z]-[(x+2y)+z]²
=(x-2y)²-z²-[(x+2y)²+2(x+2y)z+z²]
=(x-2y)²-(x+2y)²-2(x+2y)z
=4*x*2y-2xz-4yz
=8xy-2xz-4yz
很高兴为您解答,祝你学习进步!有不明白的可以追问!
如果有其他问题请另发或点击向我求助,答题不易,请谅解.
如果您认可我的回答,请点击下面的【采纳为满意回答】按钮,谢谢!
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