化简 (1 21:12:31)(3x-2y+z)(3x-2y-z)
3个回答
这够简的了 还化?
你要打开吧?
(3x-2y+z)(3x-2y-z)
=(3x-2y)^2-z^2
=9x^2-12xy+4y^2-z^2
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