<p>设3维向量<img src="https://learnfile.20230611.cn/learnAppQuestion/2b/e4/2be49dee68274389228d56a02f077024.jpg" style="width: 100%;height: auto;">满足<img src="https://learnfile.20230611.cn/learnAppQuestion/61/aa/61aa1ab506144ae9af8df3717438f965.jpg" styl