(X+Y)²-16(X-Y)² 如何分解这个因式?
问题描述:
(X+Y)²-16(X-Y)² 如何分解这个因式?
答
(X+Y)²-16(X-Y)²
=[(X+Y)+4(X-Y)]*[(X+Y)-4(X-Y)]
=(5X-3Y)(5Y-3X)