计算:(x+2y^2-3z^3)(-x-2y^2-3z^3)=?
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计算:(x+2y^2-3z^3)(-x-2y^2-3z^3)=?
计算:(x+2y^2-3z^3)(-x-2y^2-3z^3)=?
计算:(x+2y^2-3z^3)(-x-2y^2-3z^3)=?
原式=[(-3z³)+(x+2y²)][(-3z³)-(x+2y²)]
=(-3z³)²-(x+2y²)²
=9z^6-x²-4xy²-4y^4
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