2(x-3y)的平方-3(x-3y)的立方-(3y-x)的平方+(3y-x)的立方

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2(x-3y)的平方-3(x-3y)的立方-(3y-x)的平方+(3y-x)的立方
2(x-3y)的平方-3(x-3y)的立方-(3y-x)的平方+(3y-x)的立方

2(x-3y)的平方-3(x-3y)的立方-(3y-x)的平方+(3y-x)的立方
2*(x-3y)²-3(x-3y)³-(3y-x)²+(3y-x)³
=2*(x-3y)²-3(x-3y)³-(x-3y)²-(x-3y)³
=(x-3y)²-4(x-3y)³
=(x-3y)²(1-4x+12y)

解原式=2(x-3y)的平方-3(x-3y)的平方-3(x-3y)的平方-(3y-x)的平方+(3y-x)的平方+(3y-x)的平方
=-4(x-3y)的平方+(3y-x)的平方

等于
2*(x-3y)²-3(x-3y)³-(3y-x)²+(3y-x)³
=2*(x-3y)²-3(x-3y)³-(x-3y)²-(x-3y)³
=(x-3y)²-4(x-3y)³
=(x-3y)²(1-4x+12y)