设[img=14x19]1803bde947e1e35.png[/img]为三阶方阵，[img=14x19]1803bde9504f706.png[/img]为四阶方阵，且[img=126x25]1803bde957d4fc0.png[/img]则[img=86x25]1803bde95f75678.png[/img]
举一反三
- 设[img=14x19]1803bde73fca63d.png[/img]为三阶方阵，[img=14x19]1803bde74807423.png[/img]为四阶方阵，且[img=126x25]1803bde750aae45.png[/img]则[img=86x25]1803bde758dd64c.png[/img]
- 设[img=14x19]1803bdeb8d130eb.png[/img]为三阶方阵，[img=14x19]1803bdeb94f0b77.png[/img]为四阶方阵, [img=140x25]1803bdeb9c95f56.png[/img] 则行列式[img=55x27]1803bdeba4791fd.png[/img]的值为
- 设[img=14x19]1803bde8d5e7087.png[/img]为三阶方阵，[img=14x19]1803bde8ddd28ef.png[/img]为四阶方阵, [img=140x25]1803bde8e5a8d53.png[/img] 则行列式[img=55x27]1803bde8ee86bd1.png[/img]的值为
- 设A为可逆方阵，且满足[img=130x24]180368a18e9d39e.png[/img],[img=14x19]180368a19776b04.png[/img]为与A同阶的单位阵，则[img=69x27]180368a19fb4102.png[/img] A: A+E B: A-E C: A-2E D: A+2E
- 设[img=14x19]1803d913b6bd74f.png[/img]为n阶对称阵，又是反对称阵，则[img=52x19]1803d913be7c8a5.png[/img]。