<p>设向量<img alt="" width="142" height="23" style="width: 100%;height: auto;" src="https://learnfile.20230611.cn/learnAppQuestion/d0/12/d0127b5f34222587566848b7d4fff413.png"><span style="font-size: 14px;">，则<img alt="" width="45" height="20" style="wid