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)(...