爱上海后花园

不论X,Y取何值代数式(X^3Y+3X^2Y-5XY^2+6Y^3)+(Y^3+2XY^2+X^2Y-2X^3)-(4X^2Y-X^3-3XY^2+7Y^3)的值是常数

X^33X^2Y5XY^26Y^3Y^32XY^2X^2Y2X^34X^2YX^33XY^27Y^3=X^33X^2Y5XY^26Y^3Y^32XY^2X^2Y2X^34X^2YX^33XY^27Y^3=X^32X^3X^33X^2YX^2Y4X^2Y5XY^22XY^23XY^26Y^3Y^37Y^3...

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