(ax+bx+ay+by)-(ax-bx-ay-by)化简
问题描述:
(ax+bx+ay+by)-(ax-bx-ay-by)化简
答
(ax+bx+ay+by)-(ax-bx-ay-by)
=ax+bx+ay+by-ax+bx+ay+by
=2bx+2ay+2by