设 A, B 都是 n 阶可逆方阵. 则[img=148x33]1803a310502fbfd.png[/img]
A: [img=114x33]1803a31058d4945.png[/img]
B: [img=110x33]1803a31060e28e6.png[/img]
C: [img=110x33]1803a310694cd72.png[/img]
D: [img=110x33]1803a3107148329.png[/img]
A: [img=114x33]1803a31058d4945.png[/img]
B: [img=110x33]1803a31060e28e6.png[/img]
C: [img=110x33]1803a310694cd72.png[/img]
D: [img=110x33]1803a3107148329.png[/img]
举一反三
- 设 A, B 都是 n 阶可逆方阵. 则[img=148x33]180368923cfd761.png[/img] A: [img=114x33]18036892454f906.png[/img] B: [img=110x33]180368924d6cec7.png[/img] C: [img=110x33]18036892556368e.png[/img] D: [img=110x33]180368925dba457.png[/img]
- 设 A, B 都是 n 阶可逆方阵. 则[img=148x33]18031c64058a976.png[/img] A: [img=114x33]18031c640e0cef1.png[/img] B: [img=110x33]18031c6416f38e1.png[/img] C: [img=110x33]18031c641f9ee1e.png[/img] D: [img=110x33]18031c6428afd1c.png[/img]
- 设矩阵A，B，C，X为同阶方阵，A，B可逆，且有[img=79x19]18039d2116757cf.png[/img]，则矩阵X= ( ) A: [img=75x22]18039d211feab03.png[/img] B: [img=75x22]18039d2128d4a42.png[/img] C: [img=75x22]18039d2130fba14.png[/img] D: [img=75x22]18039d213a8ae69.png[/img]
- 设X, Y为两个随机变量，Var(X)=20, Var(Y)=80,[img=135x49]1803b3b774e9a0f.png[/img]，则Var(X+Y)= A: 148 B: 132 C: 126 D: 110
- 下面的结论正确的有 未知类型：{'options': ['180345c750bfe06.png，则[img=120x34]180345c75a681d0.png[/img]', '180345c763832e0.png，则[img=110x33]180345c76d08c51.png[/img]', '180345c7757c6cb.png，则[img=120x34]180345c77e22ad7.png[/img]', '180345c786b0bc2.png，则[img=110x33]180345c78e6a54e.png[/img]'], 'type': 102}