Matlab命令A=magic(3)创建一个3阶魔方矩阵，求A的逆矩阵用（ ）.
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举一反三
- Matlab命令A=magic(3)创建一个3阶魔方矩阵，求A的特征值的绝对值的最小值用（ ）. A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d605a0a8e560440081a209fc0da04637.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/e36ed713fb2e481ab69ecd158317c17e.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/6cd6fb595e6d45fd962a01d8b6ac10f5.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/64c2c88e6099475dbacd7e6d12841129.png" />
- 在常体力的情况下，平面问题的应力函数与应力分量之间的关系正确的有（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/13db38e0be0f42a8aa8220026ad6d3e5.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/9178e461e0974317b42e0e9b59149047.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d66f684595a1482283e180c311c9e8f4.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/20a366b5fd844f65a1716a7a6078b968.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/f4a5a69f1a264e5b8f28fa968022cbb0.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b77e7d17deb548619be88f5ed437af81.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cb0ce22cc89447b5b3a914b1a55209a0.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d56afcca319e46a2be256f91ac5e289b.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d6a4d2e83f9448cdbfec37887ffd53a9.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1f5fa1a13a4c48698715e2b1814291b4.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/06c0cb7f6e184b18a6b345acff91e4bb.png">，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/c59f70ea241546dd948d2f09b5821ac6.png">
- 如果矩阵A不是方阵，则下列Matlab命令中是求A的伪逆矩阵的命令是( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/a55a55e5e2df4ae1b06309e4c54acd31.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/e573fc4ebb4b46bb906fe1e1b0e368f0.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/e313a58936564d7e9df2ff1be27442e4.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/4f448c1c22e94ca08478ec36c3e5794a.png" />
- 下面和声连接对的是（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cfbbaacbd31140caada6de1a82879cf1.jpeg" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cfbbaacbd31140caada6de1a82879cf1.jpeg" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cfbbaacbd31140caada6de1a82879cf1.jpeg" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/cfbbaacbd31140caada6de1a82879cf1.jpeg" />
- 双纽线<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/ac4dfd0de9744513843c41341938f31c.png" />所围成的区域面积可用定积分表示为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b3a266adc8704187b18601cd19efc069.png" /> <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/fbc5959fd78d4d09ae216f05e45741c0.png" />. <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/02b5a6e0e400485382b137795ebb9ef1.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/45fb209600124a569d31e4c0ed4264f9.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/d5291bc308bc4880919d6f34ce4f7539.png" />