(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=
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(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=(-2x^2y)
(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=
(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=
(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3=
(-2x^2y)^3+6(x^2)^2*(-x)^2*(-y)^3-3x^3(-xy)^3
=-8x^6y^3+6x^4×x^2×(-y^3)+3x^6y^3
=-8x^6y^3-6x^6y^3+3x^6y^3
=-11x^6y^3;
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