<p>设向量<img alt="" width="55" height="15" style="width: 100%;height: auto;" src="https://learnfile.20230611.cn/learnAppQuestion/04/fa/04fad78ebf421c0f17c70cf67fcd0550.png">，则<img alt="" width="11" height="12" style="width: 100%;height: auto;" src="htt