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]
A: [img=114x33]18031c640e0cef1.png[/img]
B: [img=110x33]18031c6416f38e1.png[/img]
C: [img=110x33]18031c641f9ee1e.png[/img]
D: [img=110x33]18031c6428afd1c.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]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]
- 设随机变量X的概率密度为f(x)，则f(x)一定满足( ). A: 0≤f(x)≤1 B: [img=183x53]1803b451bb3373a.png[/img] C: [img=133x51]1803b451c807078.png[/img] D: f(+∞)=1
- 设三阶方阵[img=117x75]17da6265af67565.png[/img]有特征值[img=36x21]17da6265c0f8ef3.png[/img],则[img=26x15]17da6265d451088.png[/img] ,[img=27x17]17da5b7f743dcc3.png[/img] . A: x=1, y=1 B: x=2, y=1 C: x=3, y=0 D: x=0, y=3
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]18036de4b8088be.png[/img] B: [img=75x24]18036de4bf77b71.png[/img] C: [img=75x24]18036de4c8172a3.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)