[极限] 一题极限

楼主: anger50322 (江)   2014-04-29 14:00:18
http://i.imgur.com/wYruRt2.jpg
lim(x+a)^x/(x-a)^x
x=>无限大
答案是e^(2a),可是我怎么算都是0 ??

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