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若圆x2+y2-4x-4y-10=0上至少有三个不同的点到直线l:ax+by=0...
若圆x
2+y
2-4x-4y-10=0上至少有三个不同的点到直线l:ax+by=0的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670011_ST/0.png)
,则直线l的倾斜角的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670011_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670011_ST/4.png)
考点分析:
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设
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,则对任意实数a,b,a+b≥0是f(a)+f(b)≥0的( )
A.充分必要条件
B.充分而非必要条件
C.必要而非充分条件
D.既非充分也非必要条件
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设圆锥曲线r的两个焦点分别为F
1,F
2,若曲线r上存在点P满足|PF
1|:|F
1F
2|:|PF
2|=4:3:2,则曲线r的离心率等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670009_ST/0.png)
B.
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或2
C.
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2
D.
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如图,目标函数P=ax+y仅在封闭区域OACB内(包括边界)的点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670008_ST/0.png)
处取得最大值,则a的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670008_ST/images1.png)
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670008_ST/3.png)
D.
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已知y=Asin(ωx+ϕ)的最大值为1,在区间
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上,函数值从1减小到-1,函数图象(如图)与y轴的交点P坐标是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670007_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670007_ST/1.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670007_ST/3.png)
D.以上都不是
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数列{a
n},已知对任意正整数n,a
1+a
2+a
3+…+a
n=2
n-1,则a
12+a
22+a
32+…+a
n2 等于( )
A.(2
n-1)
2B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670006_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231455230467000/SYS201311012314552304670006_ST/1.png)
D.4
n-1
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