化简:(1)(-x²+y²)²;(2)(x+2y-3z)(x-2y+3z).
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化简:(1)(-x²+y²)²;(2)(x+2y-3z)(x-2y+3z).
化简:(1)(-x²+y²)²;(2)(x+2y-3z)(x-2y+3z).
化简:(1)(-x²+y²)²;(2)(x+2y-3z)(x-2y+3z).
(1)是乱码
(2)(x+2y-3z)(x-2y+3z)=[x+(2y-3z)][x-(2y-3z)]=x的二次方-(2y-3z)的二次方