设函数[img=34x25]1803a4b203a4b82.png[/img]和[img=33x25]1803a4b20c24a6a.png[/img]互为反函数，则[img=72x43]1803a4b214a0e18.png[/img]的反函数是
A: [img=72x43]1803a4b21e1dfc7.png[/img]
B: [img=72x43]1803a4b22751c04.png[/img]
C: [img=61x39]1803a4b22f3bc08.png[/img]
D: [img=72x43]1803a4b2381dcdc.png[/img]
A: [img=72x43]1803a4b21e1dfc7.png[/img]
B: [img=72x43]1803a4b22751c04.png[/img]
C: [img=61x39]1803a4b22f3bc08.png[/img]
D: [img=72x43]1803a4b2381dcdc.png[/img]
举一反三
- 设函数[img=34x25]1803a4b203a4b82.png[/img]和[img=33x25]1803a4b20c24a6a.png[/img]互为反函数，则[img=72x43]1803a4b214a0e18.png[/img]的反函数是 未知类型：{'options': ['', '', '', ''], '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[img=77x19]1802e2aa5a4095f.jpg[/img]，则E(X)=4，D(X)=4/3.
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2c47707b95.png[/img] B: [img=86x65]1802f2c47feb07a.png[/img] C: [img=75x58]1802f2c4884644b.png[/img] D: [img=87x58]1802f2c48fffbbf.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2a8aba67a6.png[/img] B: [img=86x65]1802f2a8b46de33.png[/img] C: [img=75x58]1802f2a8bcdd988.png[/img] D: [img=87x58]1802f2a8c497bb0.png[/img]