设，矩阵，，其中E为n阶单位阵，则BC等于().http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/639791db15504432a1d753ce6bddbdfa.png
举一反三
- 设，为n阶方阵的伴随阵、逆矩阵，则（ )https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/9642423ef3774c65b6e247e2ce40b223.png
- 求解线性方程组<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/880cd7ef18d94cc0aa4ee9c0b7118d33.png" />的雅可比迭代矩阵是___________. A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/1408cafef14540b494c7b6c38ea2e6cf.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/568a94ce0d574f3ba8a3baf7e3b2ed88.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/763ed8aa81884ee18fc5168914e29a6f.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/467528c3ec81466494978179c7c43c48.png" />
- 设<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bed4f91f4fec44358e1cad3163fc6b90.png" />是在区间<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a58a11f71a434f2ab38a2f347802f010.png" />上的<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/a392447e03794318affaa2b03bb5967b.png" />的分段线性插值函数，以下条件不是<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/c00fe77a8291453a8cb2577eb68735ad.png" />必须满足的条件是________________. A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/cf6e811a4488413fae8f1839e4d098ea.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/bb93b2d7d02245878ec51e2986c97b5d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/ec6692c00c2e49b6adbf9b0493638b81.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/214f277da4154f58a43751f80b09d959.png" />
- 已知轴的主视图，根据标注选择所对应的正确的断面图，其中正确的B-B是（ ）。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/fb36fa86ece84fbcbc0f2230abb855ad.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/0310f38d6cfc4fdd8b4d527907f732a3.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/dba503dc28c741698b1cf083200d24ad.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/1b977d55d6a84bceb9e6c39b7f9d878c.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/82093ffe849a4e789e46eaf4c768a318.png" />
- 设，则A的谱半径________.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/ae166ab2c3c940a2815ed79c253e1565.png