<p>若向量<img src="https://learnfile.20230611.cn/learnAppQuestion/d7/9e/d79e1b36bf58a1076fd2d67db11898ce.jpg" style="width: 100%;height: auto;">且<img src="https://learnfile.20230611.cn/learnAppQuestion/c9/cd/c9cd3e7ef98b48d5f0bbaf78d601bc0b.jpg" style="