问答

<p>&quot;https://www.zhihu.com/equation?tex=%7B%5Cbf%7BK%7D%7D%3D%5Cbegin%7Bbmatrix%7D+4.5+%26+1.2+%26-3.3%5C%5C+1.2+%26+6.0+%26+1.9+%5C%5C+-3.3+%26+1.9+%26+4.7+%5Cend%7Bbmatrix%7D+%2C%5Cquad+%7B%5Cbf%7BF%7D%7D%3D%5Cbegin%7BBmatrix%7D+2.1%5C%5C0.0%5C%5C-0.5+%5Cend%7BBmatrix%7D+%2C%5Cquad+%7B%5Cbf%7BU%7D%7D%3D+%5Cbegin%7BBmatrix%7D+u_1%5C%5C+u_2%5C%5C+u_3+%5Cend%7BBmatrix%7D+%5C%5C&quot;</p><p>fsdgsdfdsf</p><p>sdfdsfdsfdsf</p><p>第三方第三方<br /></p>