设A为5*4矩阵, r(A)=2. 如果[img=447x28]1802ce713ae5798.png[/img]为方程组[img=63x23]1802ce7142a4ebb.png[/img]的3个解向量, 则[img=63x23]1802ce7142a4ebb.png[/img]的导出方程组[img=62x19]1802ce71546ed5d.png[/img]的解空间一个规范正交基的是（ ）.
A: [img=278x125]1802ce715f4e7c7.png[/img]
B: [img=278x125]1802ce716b4f976.png[/img]
C: [img=278x125]1802ce7176ad49c.png[/img]
D: [img=278x125]1802ce7180d0768.png[/img]
A: [img=278x125]1802ce715f4e7c7.png[/img]
B: [img=278x125]1802ce716b4f976.png[/img]
C: [img=278x125]1802ce7176ad49c.png[/img]
D: [img=278x125]1802ce7180d0768.png[/img]
举一反三
- 设A为5*4矩阵, r(A)=2. 如果[img=447x28]1802ce713ae5798.png[/img]为方程组[img=63x23]1802ce7142a4ebb.png[/img]的3个解向量, 则[img=63x23]1802ce7142a4ebb.png[/img]的导出方程组[img=62x19]1802ce71546ed5d.png[/img]的解空间一个规范正交基的是（ ）. 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]
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ，则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- 设随机变量X~B(3, 0.4)，[img=102x27]18037032d38dcea.png[/img], 则P(Y=1)的值为 A: 0.504 B: 63/125 C: 0.432 D: 0.288 E: 0.496 F: 27/125 G: 36/125 H: 4/25
- 设随机变量X~B(3, 0.4)，[img=102x27]1802d3ec87fec7a.png[/img], 则P(Y=1)的值为 A: 0.504 B: 63/125 C: 0.432 D: 0.288 E: 0.496 F: 27/125 G: 36/125 H: 4/25