设 [img=16x19]18030b7d1d1a17d.png[/img] 为 3 阶方阵, [img=15x19]18030b7d2502f11.png[/img] 为 [img=40x20]18030b7d2d14e7c.png[/img] 矩阵, 则下列矩阵中, [ ]一定是对称矩阵.
A: [img=68x25]18030b7d35dfe28.png[/img]
B: [img=46x23]18030b7d3e97474.png[/img]
C: [img=44x23]18030b7d46c6bfc.png[/img]
D: [img=60x25]18030b7d4f1fdcf.png[/img]
E: [img=60x23]18030b7d57840d6.png[/img]
F: [img=66x25]18030b7d5faaf20.png[/img]
G: [img=61x23]18030b7d689a2e4.png[/img]
H: [img=107x25]18030b7d711c334.png[/img]
A: [img=68x25]18030b7d35dfe28.png[/img]
B: [img=46x23]18030b7d3e97474.png[/img]
C: [img=44x23]18030b7d46c6bfc.png[/img]
D: [img=60x25]18030b7d4f1fdcf.png[/img]
E: [img=60x23]18030b7d57840d6.png[/img]
F: [img=66x25]18030b7d5faaf20.png[/img]
G: [img=61x23]18030b7d689a2e4.png[/img]
H: [img=107x25]18030b7d711c334.png[/img]
举一反三
- 设X,Y为两个随机变量,且[img=179x25]1803395d555effc.png[/img] , [img=226x25]1803395d61f1a43.png[/img] ,则[img=143x25]1803395d6f00057.png[/img]= ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
- 设(X,Y)的分布律为[img=317x47]18039fa216cb556.png[/img]V=max(X,Y), 则P(V=1)等于 A: 1/7 B: 2/7 C: 3/7 D: 4/7
- 设(X,Y)的分布律为[img=317x47]18036e2ccb88792.png[/img]V=max(X,Y), 则P(V=1)等于 A: 1/7 B: 2/7 C: 3/7 D: 4/7
- 设(X,Y)的分布律为[img=317x47]18032d0bb35767f.png[/img]V=max(X,Y), 则P(V=1)等于 A: 1/7 B: 2/7 C: 3/7 D: 4/7
- 设(X,Y)的分布律为[img=317x47]1803e18fce4cd69.png[/img]V=max(X,Y), 则P(V=1)等于 A: 1/7 B: 2/7 C: 3/7 D: 4/7