(a／a-2－a/a+2)×4-a方／a 化简
问题描述：
(a／a-2－a/a+2)×4-a方／a 化简
答
{[a/(a-2)-a/(a+2)]*(4-a²)}/a
={[(a²+2a-a²+2a)/(a-2)(a+2)]*(4-a²)}/a
={[4a/(a²-4)]*(4-a²)}/a
=-4a/a
=-4