a²(x-y)³+4b²(y-x)³
问题描述:
a²(x-y)³+4b²(y-x)³
答
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)