满分5 >
高中数学试题 >
由动点P向圆x2+y2=1引两条切线PA、PB,切点分别为A、B,∠APB=60...
由动点P向圆x2+y2=1引两条切线PA、PB,切点分别为A、B,∠APB=60°,则动点P的轨迹方程为 .
考点分析:
相关试题推荐
a
2+b
2=1,b
2+c
2=2,c
2+a
2=2,则ab+bc+ca的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/2.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/3.png)
C.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/5.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747011_ST/6.png)
+
查看答案
从数字1,2,3,4,5中,随机抽取3个数字(允许重复)组成一个三位数,其各位数字之和等于9的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747010_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747010_ST/2.png)
D.
查看答案
已知正四面体ABCD的表面积为S,其四个面的中心分别为E、F、G、H.设四面体EFGH的表面积为T,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747009_ST/0.png)
等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747009_ST/3.png)
D.
查看答案
为了得到函数y=sin(2x-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747008_ST/0.png)
)的图象,可以将函数y=cos2x的图象( )
A.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747008_ST/1.png)
个单位长度
B.向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747008_ST/2.png)
个单位长度
C.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747008_ST/3.png)
个单位长度
D.向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212129778074786/SYS201310232121297780747008_ST/4.png)
个单位长度
查看答案