<p>若数列<img src="https://learnfile.20230611.cn/learnAppQuestion/72/00/72000ba1a2018bac91e3c2d36dddcb99.jpg" style="width: 100%;height: auto;">则<img src="https://learnfile.20230611.cn/learnAppQuestion/5f/f8/5ff8020c538abb7f90292571e9e1f185.jpg" style="