<p>设数列<img src="https://learnfile.20230611.cn/learnAppQuestion/d6/19/d6195298384cdb747d49646fbead9634.jpg" style="width: 100%;height: auto;">有界，又<img src="https://learnfile.20230611.cn/learnAppQuestion/88/79/88793b290a409c8b909cd8f5bb37763c.jpg" styl