(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(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详细计算过程(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详
(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详细计算过程
(x-2y-z)(x-2y+z)-(x+2y+z)^2此题详细计算过程
(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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