设A是m阶正定矩阵, B是[img=41x19]1802ce900eb011c.png[/img]实矩阵. 则实对称矩阵[img=50x23]1802ce9016c85bf.png[/img]为正定矩阵的充分必要条件是( ).
A: [img=76x25]1802ce901faa12e.png[/img]
B: [img=107x25]1802ce9027e309d.png[/img]
C: [img=69x25]1802ce9030db745.png[/img]
D: [img=102x25]1802ce903a7ff8a.png[/img]
A: [img=76x25]1802ce901faa12e.png[/img]
B: [img=107x25]1802ce9027e309d.png[/img]
C: [img=69x25]1802ce9030db745.png[/img]
D: [img=102x25]1802ce903a7ff8a.png[/img]
举一反三
- 设A是m阶正定矩阵, B是[img=41x19]1802ce900eb011c.png[/img]实矩阵. 则实对称矩阵[img=50x23]1802ce9016c85bf.png[/img]为正定矩阵的充分必要条件是( ). 未知类型：{'options': ['', '', '', ''], 'type': 102}
- 设A为m阶正定矩阵, B为[img=49x19]1802ce90d470837.png[/img]矩阵. 如果[img=50x23]1802ce90dd935f4.png[/img]是正定矩阵, 那么[img=55x25]1802ce90e60cb5f.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[img=117x51]1802ce90457e2e4.png[/img]是正定矩阵, 其中A是m阶矩阵, D是n阶矩阵,下列说法不正确的是( ) A: A是正定矩阵，且[img=69x23]1802ce904f8fdca.png[/img] B: A，D都是正定矩阵，且[img=60x23]1802ce905889cb8.png[/img] C: [img=96x25]1802ce9060b32e7.png[/img]是正定矩阵，且[img=63x23]1802ce9069b2f67.png[/img] D: [img=96x25]1802ce9060b32e7.png[/img]是正定矩阵，且[img=59x23]1802ce907ae6af1.png[/img]
- 设A是n(>1)阶正定矩阵，则下列结论正确的是 A: [img=57x25]18032f0e301deb7.png[/img] B: [img=92x25]18032f0e3820079.png[/img] C: [img=167x22]18032f0e407cace.png[/img] D: [img=21x20]18032f0e485757c.png[/img]也是正定矩阵 E: [img=49x23]18032f0e5009f43.png[/img]也是正定矩阵,[img=13x19]18032f0e58abd4d.png[/img]为[img=11x14]18032f0e6062128.png[/img]阶实矩阵