a²(x-y)³+4b²(y-x)³
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a²(x-y)³+4b²(y-x)³a²(x-y)³+4b²(y-x)³a²(x-y)³+4b
a²(x-y)³+4b²(y-x)³
a²(x-y)³+4b²(y-x)³
a²(x-y)³+4b²(y-x)³
a²(x-y)³+4b²(y-x)³
=a²(x-y)³-4b²(X-Y)³
=(x-y)³（a²-4b²）
=(x-y)³（a+2b）（a-2b)