设[img=11x14]1802ce7a9561c65.png[/img]阶矩阵[img=55x23]1802ce7a9e278f9.png[/img]满足关系式[img=62x19]1802ce7aa6ea9f9.png[/img]，那么必有( )
A: [img=72x19]1802ce7aaf64f24.png[/img]
B: [img=72x19]1802ce7ab73eb03.png[/img]
C: [img=62x19]1802ce7abf67527.png[/img]
D: [img=72x19]1802ce7ac76b979.png[/img]
A: [img=72x19]1802ce7aaf64f24.png[/img]
B: [img=72x19]1802ce7ab73eb03.png[/img]
C: [img=62x19]1802ce7abf67527.png[/img]
D: [img=72x19]1802ce7ac76b979.png[/img]
举一反三
- 设[img=11x14]1802ce7a9561c65.png[/img]阶矩阵[img=55x23]1802ce7a9e278f9.png[/img]满足关系式[img=62x19]1802ce7aa6ea9f9.png[/img]，那么必有( ) A: [img=72x19]1802ce7aaf64f24.png[/img] B: [img=72x19]1802ce7ab73eb03.png[/img] C: [img=62x19]1802ce7abf67527.png[/img] D: [img=72x19]1802ce7ac76b979.png[/img]
- 原电池（-）Pt︱Fe[img=17x22]1803dd54de61136.png[/img](1 mol·L[img=17x22]1803dd54e7299c0.png[/img]),Fe[img=17x22]1803dd54f0030fb.png[/img](1 mol·L[img=17x22]1803dd54fa39c0d.png[/img])‖Ce[img=17x22]1803dd5502f9d6b.png[/img]( mol·L[img=17x22]1803dd550b82a7d.png[/img]) ,Ce[img=17x22]1803dd55130efd2.png[/img]( mol·L[img=17x22]1803dd551af174c.png[/img]) ︱Pt(+)的电池反应是( )。 A: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] B: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] C: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] D: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img]
- 设随机变量X,Y相互独立，且[img=105x25]18034eb3b21c90e.png[/img], [img=91x25]18034eb3babebfa.png[/img]，则D(2X-3Y)=______________。 A: 7/3 B: 19/3 C: 3 D: 以上都不是
- 设随机变量X,Y相互独立，且[img=105x25]17de897cfccf0b7.png[/img], [img=91x25]17de897d08bc770.png[/img]，则D(2X-3Y)=______________。 A: 7/3 B: 19/3 C: 3 D: 以上都不是
- 设随机变量X,Y相互独立，且[img=105x25]18034e9003367da.png[/img], [img=91x25]18034e900bf8a13.png[/img]，则D(2X-3Y)=______________。 A: 7/3 B: 19/3 C: 3 D: 以上都不是