<p>设数列<img src="https://file.gaojiufeng.cn/learnAppQuestion/d6/19/d6195298384cdb747d49646fbead9634.jpg" style="width: 100%;height: auto;">有界，又<img src="https://file.gaojiufeng.cn/learnAppQuestion/88/79/88793b290a409c8b909cd8f5bb37763c.jpg" style="width: 100%;height: auto;">，则<img src="https://file.gaojiufeng.cn/learnAppQuestion/12/07/120774f4cb1838fd4b6719c827e0f4cd.jpg" style="width: 100%;height: auto;"></p>