满分5 >
高中数学试题 >
已知圆O的半径为1,PA、PB为该圆的两条切线,A、B为俩切点,那么的最小值为(...
已知圆O的半径为1,PA、PB为该圆的两条切线,A、B为俩切点,那么
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511008_ST/0.png)
的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511008_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511008_ST/4.png)
考点分析:
相关试题推荐
f(x)在R上满足f(x)=3f(2-x)-x
2+10x-7,则曲线y=f(x)在点(1,f(x))处的切线方程是( )
A.y=-2x+1
B.y=-2x+3
C.y=2x-1
D.y=2x-3
查看答案
若函数f(x)=2x
2-lnx在其定义域内的一个子区间(k-1,k+1)内不是单调函数,则实数k的取值范围是( )
A.[1,+∞)
B.[1,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511006_ST/0.png)
)
C.[1,2)
D.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511006_ST/1.png)
,2)
查看答案
已知在函数f(x)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511005_ST/0.png)
图象上,相邻的一个最大值点与一个最小值点恰好在圆x
2+y
2=R
2上,则f(x)的最小正周期为( )
A.1
B.2
C.3
D.4
查看答案
在△ABC中,a,b,c分别为三个内角A,B,C所对的边,设向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511004_ST/0.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511004_ST/1.png)
,则角A的大小为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511004_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511004_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511004_ST/4.png)
D.
查看答案
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511003_ST/0.png)
的图象可能是下列图象中的( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101223756883551121/SYS201311012237568835511003_ST/images3.png)
D.
查看答案