已知曲面 [img=118x26]18031b9c1481410.png[/img] 上点[img=12x19]18031b9c1dee521.png[/img]处的切平面平行于平面 [img=151x22]18031b9c269e8e5.png[/img] 则点 [img=12x19]18031b9c1dee521.png[/img]的坐标为[img=30x25]18031b9c382c62c.png[/img]
A: [img=69x25]18031b9c4082bc2.png[/img]
B: [img=69x25]18031b9c48a8c2b.png[/img]
C: [img=55x25]18031b9c508399b.png[/img]
D: [img=83x25]18031b9c583fe28.png[/img]
A: [img=69x25]18031b9c4082bc2.png[/img]
B: [img=69x25]18031b9c48a8c2b.png[/img]
C: [img=55x25]18031b9c508399b.png[/img]
D: [img=83x25]18031b9c583fe28.png[/img]
举一反三
- 设随机变量X[img=138x21]17e438ba4537f6f.jpg[/img],则由切比雪夫不等式[img=134x19]17e43eeb4a5ffad.jpg[/img] A: 1/9 B: 4/9 C: 8/9 D: 1
- 设随机变量X[img=138x21]17e0bcf1c82597b.jpg[/img],则由切比雪夫不等式[img=134x19]17e0bd06202ebd9.jpg[/img] A: 1/9 B: 4/9 C: 8/9 D: 1
- 已知曲面 [img=118x26]18031ba0b836db0.png[/img] 上点[img=12x19]18031ba0c0a54f9.png[/img]处的切平面平行于平面 [img=151x22]18031ba0c99ade9.png[/img] 则点 [img=12x19]18031ba0c0a54f9.png[/img]的坐标为[img=30x25]18031ba0db0c055.png[/img] A: [img=69x25]18031ba0e348195.png[/img] B: [img=69x25]18031ba0ebf8197.png[/img] C: [img=55x25]18031ba0f44757e.png[/img] D: [img=83x25]18031ba0fcb957a.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
- X为随机变量,E(X)=-1,D(X)=3,则[img=105x27]17de66c4ef75d99.png[/img] A: 18 B: 9 C: 30 D: 32