化简求职:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²,其中x=1,y=-1,z=1

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化简求职:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²,其中x=1,y=-1,z=1

化简求职:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²,其中x=1,y=-1,z=1
化简求职:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²
化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²
化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²,其中x=1,y=-1,z=1

化简求职:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²化简求值:(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²,其中x=1,y=-1,z=1
(2x-y+3z)(-2x-y-3z)-(x+2y-3z)²
=-(2x-y+3z)(2x+y+3z)-(x+2y-3z)²
=-[(2x+3z)²-y²]-(x+2y)²+6z(x+2y)-9z²
=-4x²-12xz-9z²+y²-x²-4xy-4y²+6xz+12yz-9z²
=-5x²-3y²-18z²-6xz+12yz-4xy