设[img=163x71]1802ce8e93a3a93.png[/img]是3阶实对称矩阵, 那么A与( )是合同的.
A: [img=132x63]1802ce8ea14cf5b.png[/img]
B: [img=146x65]1802ce8eacf1c7c.png[/img]
C: [img=163x71]1802ce8eb800916.png[/img]
D: [img=146x65]1802ce8ec221e9a.png[/img]
A: [img=132x63]1802ce8ea14cf5b.png[/img]
B: [img=146x65]1802ce8eacf1c7c.png[/img]
C: [img=163x71]1802ce8eb800916.png[/img]
D: [img=146x65]1802ce8ec221e9a.png[/img]
举一反三
- 随机变量X的分布律如下表[img=210x86]17de6027b9f95df.png[/img]则D( X ) =（ ）． A: 7/8 B: 15/8 C: 71/64 D: 71/4
- 设[img=163x71]1802ce8e93a3a93.png[/img]是3阶实对称矩阵, 那么A与( )是合同的. 未知类型：{'options': ['', '', '', ''], 'type': 102}
- 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]
- （5切比雪夫不等式）设随机变量X的期望E(X)=μ，方差D(X)=[img=14x17]17e43703436673a.jpg[/img]，利用切比雪夫不等式估计P{|X-E(X)|[img=30x16]17e437fbfd2e01c.jpg[/img]}>; () A: 1/9 B: 1/3 C: 8/9 D: 1
- 随机变量X的分布律如下表[img=198x85]1803c07c0768ce1.png[/img]则D ( 4X +1 )的值为（ ）. A: 7/8 B: 15/8 C: 71/64 D: 71/4