满分5 >
高中数学试题 >
抛物线的弦与过弦的端点的两条切线所围成的三角形常被称为阿基米德三角形,阿基米德三...
抛物线的弦与过弦的端点的两条切线所围成的三角形常被称为阿基米德三角形,阿基米德三角形有一些有趣的性质,如:若抛物线的弦过焦点,则过弦的端点的两条切线的交点在其准线上.设抛物线y
2=2px(p>0),弦AB过焦点,△ABQ为其阿基米德三角形,则△ABQ的面积的最小值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897009_ST/0.png)
B.p
2C.2p
2D.4p
2
考点分析:
相关试题推荐
设A、B两地位于北纬α的纬线上,且两地的经度差为90°,若地球的半径为R千米,且时速为20千米的轮船从A地到B地最少需要
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897008_ST/0.png)
小时,则α为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897008_ST/3.png)
D.
查看答案
已知A为xoy平面内的一个区域.甲:点(a,b)∈
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897007_ST/0.png)
;乙:点(a,b)∈A.如果甲是乙的必要条件,那么区域A的面积( )
A.最小值为2
B.无最大值
C.最大值为2
D.最大值为1
查看答案
现随机安排一批志愿者到三个社区服务,则其中来自同一个单位的3名志愿者恰好被安排在两个不同的社区服务的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897006_ST/2.png)
D.
查看答案
设a,b为两条直线,α,β为两个平面,下列四个命题中,正确的命题是( )
A.若a,b与α所成的角相等,则α∥b
B.若a∥α,b∥β,α∥β,则a∥b
C.若a⊂α,b⊂β,α∥b,则α∥β
D.若a⊥α,b⊥β,α⊥β,是a⊥b
查看答案
若sin(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/0.png)
)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/1.png)
,则cos(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/2.png)
)( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/3.png)
B.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183308915689703/SYS201310241833089156897004_ST/5.png)
D.
查看答案