(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y-Y^3)求解法

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(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y-Y^3)求解法(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y

(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y-Y^3)求解法
(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y-Y^3)求解法

(2x^3-3X^2Y-2XY^2)-(X^3-2XY^2+Y^3)+(-X^3+3X^2Y-Y^3)求解法
原式=2x^3-3X^2Y-2XY^2-X^3+2XY^2-Y^3-X^3+3X^2Y-Y^3
=2x^3-X^3-X^3-3X^2Y+3X^2Y-2XY^2+2XY^2-Y^3-Y^3
=0-0-0-2Y^3
=-2Y^3