计算 (3x^2-4y^3)(-3x^2-4y^3)-(-3x^2-4y^3)^2
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计算 (3x^2-4y^3)(-3x^2-4y^3)-(-3x^2-4y^3)^2
计算 (3x^2-4y^3)(-3x^2-4y^3)-(-3x^2-4y^3)^2
计算 (3x^2-4y^3)(-3x^2-4y^3)-(-3x^2-4y^3)^2
(3x^2-4y^3)(-3x^2-4y^3)-(-3x^2-4y^3)^2
=(-3x^2-4y^3)(3x^2-4y^3+3x^2+4y^3)
=-6x^2(3x^2+4y^3)
=-18x^4-24x^2y^3
-18X^4-24X^2 y^3
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