曲线[img=116x55]18039ca4c10260b.png[/img]的参数方程可以表示为（ ）.
A: [img=166x110]18039ca4cb56668.png[/img]
B: [img=166x76]18039ca4d64a661.png[/img]
C: [img=157x110]18039ca4e18a421.png[/img]
D: [img=157x76]18039ca4eb86853.png[/img]
A: [img=166x110]18039ca4cb56668.png[/img]
B: [img=166x76]18039ca4d64a661.png[/img]
C: [img=157x110]18039ca4e18a421.png[/img]
D: [img=157x76]18039ca4eb86853.png[/img]
举一反三
- 曲线[img=116x55]1802cfd7564c1e0.png[/img]的参数方程可以表示为（ ）. A: [img=166x110]1802cfd75fc0bdb.png[/img] B: [img=166x76]1802cfd76ab2f72.png[/img] C: [img=157x110]1802cfd776201e1.png[/img] D: [img=157x76]1802cfd7801a3c8.png[/img]
- 曲线[img=116x55]18036ef1df273c7.png[/img]的参数方程可以表示为（ ）. A: [img=166x110]18036ef1ea56697.png[/img] B: [img=166x76]18036ef1f4ec0ec.png[/img] C: [img=157x110]18036ef2008e752.png[/img] D: [img=157x76]18036ef20b0e010.png[/img]
- 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.
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]