(x-2y+3z)²-(x+2y-3z)²
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(x-2y+3z)²-(x+2y-3z)²(x-2y+3z)²-(x+2y-3z)²(x-2y+3z)²-(x+2y-3z)²原式=[(x-
(x-2y+3z)²-(x+2y-3z)²
(x-2y+3z)²-(x+2y-3z)²
(x-2y+3z)²-(x+2y-3z)²
原式=[(x-2y+3z-(x+2y-3z)]*[(x-2y+3z)+(x+2y-3z)]
=(6z-4y)*2x
=12xz-8xy