suan ti(x+3y-2z)(x+3y+2z)-(x-2y+3z)(x+2y+3z)求guo c
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suan ti
(x+3y-2z)(x+3y+2z)-(x-2y+3z)(x+2y+3z)求guo c
(x+3y-2z)(x+3y+2z)-(x-2y+3z)(x+2y+3z)求guo c
(x+3y-2z)(x+3y+2z)-(x-2y+3z)(x+2y+3z)
=(x+3y)^2-(2z)^2-(x+3z)^2+(2y)^2
=13y^2-13z^2+6xy-6xz
=(x+3y)^2-(2z)^2-(x+3z)^2+(2y)^2
=13y^2-13z^2+6xy-6xz
suan ti(x+3y-2z)(x+3y+2z)-(x-2y+3z)(x+2y+3z)求guo c
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