锐角的集合可以写作
A: [img=52x59]1802e90e3d211a5.jpg[/img]
B: [img=59x51]1802e90e458312a.jpg[/img]
C: [img=67x59]1802e90e4df22e5.jpg[/img]
D: [img=60x27]1802e90e57a8d3b.jpg[/img]
A: [img=52x59]1802e90e3d211a5.jpg[/img]
B: [img=59x51]1802e90e458312a.jpg[/img]
C: [img=67x59]1802e90e4df22e5.jpg[/img]
D: [img=60x27]1802e90e57a8d3b.jpg[/img]
举一反三
- 锐角的集合可以写作 A: [img=52x59]1803d0504b4c6b5.jpg[/img] B: [img=59x51]1803d05053f4c3c.jpg[/img] C: [img=67x59]1803d0505c77d05.jpg[/img] D: [img=60x27]1803d050659c176.jpg[/img]
- 锐角的集合可以写作 A: [img=52x59]18037fa7a7a576b.jpg[/img] B: [img=59x51]18037fa7b0a272e.jpg[/img] C: [img=67x59]18037fa7b8eb183.jpg[/img] D: [img=60x27]18037fa7c1d7a8c.jpg[/img]
- 设投掷1颗骰子的点数为X,则( ) 未知类型：{'options': ['E(X)=3.5,D(X)= [img=29x21]17e43c3db9dc21b.png[/img]', ' E(X)=3.5, D(X)= [img=22x41]17e43c3dc2146ee.png[/img]', ' E(X)=3.5,D(X)=3.5', ' E(X)=3.5,D(X)=[img=22x41]17e43c3dcacf7d1.png[/img]'], 'type': 102}
- 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X为随机变量，若数学期望E(X)存在，则数学期望E(E(X))=__________。 A: E(X) B: 0 C: [img=51x27]18038f919d83a08.png[/img] D: [img=63x27]18038f91a6f0476.png[/img]