x3-y3和x3+y3怎么因式分解

问题描述:

x3-y3和x3+y3怎么因式分解

X³-Y³=X³-XY²+XY²-Y³=X(X²-Y²)+Y²(X-Y)=X(X-Y)(X+Y)+Y²(X-Y)=(X-Y)[X(X+Y)+Y²]=(X-Y)(X²+XY+Y²)X&sup3...