满分5 >
高中数学试题 >
等边△PQR中,P(0,0)、Q(4,0),且R在第四象限内,则PR和QR所在直...
等边△PQR中,P(0,0)、Q(4,0),且R在第四象限内,则PR和QR所在直线的方程分别为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/1.png)
和
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/4.png)
和
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627002_ST/5.png)
考点分析:
相关试题推荐
已知直线3x+2y-3=0和6x+my+1=0互相平行,则它们之间的距离是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627001_ST/2.png)
D.
查看答案
在同一直角坐标系中,表示直线y=ax与y=x+a正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627000_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627000_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535362734/SYS201311031012485353627000_ST/images2.png)
D.
查看答案
已知函数f(x)=ln(2ax+1)+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183021_ST/0.png)
-x
2-2ax(a∈R).
(1)若x=2为f(x)的极值点,求实数a的值;
(2)若y=f(x)在[3,+∞)上为增函数,求实数a的取值范围;
(3)当a=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183021_ST/1.png)
时,方程f(1-x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183021_ST/2.png)
有实根,求实数b的最大值.
查看答案
已知中心在原点,焦点在坐标轴上的椭圆Ω,它的离心率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183020_ST/0.png)
,一个焦点和抛物线y
2=-4x的焦点重合,过直线l:x=4上一点M引椭圆Ω的两条切线,切点分别是A,B.
(Ⅰ)求椭圆Ω的方程;
(Ⅱ)若在椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183020_ST/1.png)
上的点(x
,y
)处的椭圆的切线方程是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183020_ST/2.png)
.求证:直线AB恒过定点C;并出求定点C的坐标.
(Ⅲ)是否存在实数λ,使得|AC|+|BC|=λ|AC|•|BC|恒成立?(点C为直线AB恒过的定点)若存在,求出λ的值;若不存在,请说明理由.
查看答案
如图,AB为圆O的直径,点E、F在圆O上,AB∥EF,矩形ABCD所在的平面与圆O所在的平面互相垂直.已知AB=2,EF=1.
(Ⅰ)求证:平面DAF⊥平面CBF;
(Ⅱ)求直线AB与平面CBF所成角的大小;
(Ⅲ)当AD的长为何值时,平面DFC与平面FCB所成的锐二面角的大小为60°?
查看答案