在平面直角坐标系中,若
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,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780023_ST/1.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780023_ST/2.png)
.
(Ⅰ)求动点M(x,y)的轨迹C的方程;
(Ⅱ)已知点N(2,1),是否存在一条直线l与轨迹C相交于A、B两点,且以点N为线段AB的中点?若存在,求出直线l的方程;不存在,请说明理由.
考点分析:
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(文)某大楼共5层,4个人从第一层上电梯,假设每个人都等可能地在每一层下电梯,并且他们下电梯与否相互独立.又知电梯只在有人下时才停止.
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已知向
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780020_ST/0.png)
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(Ⅰ)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780020_ST/1.png)
的值域;
(Ⅱ)若函数y=f(x)的图象关于直线x=α(α>0)对称,求α的最小值.
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对于下列四个命题
①若向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/1.png)
,满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/2.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/3.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/4.png)
的夹角为钝角;
②已知集合A=正四棱柱,B=长方体,则A∩B=B;
③在直角坐标平面内,点M(|a|,|a-3|)与N(cosα,sinα)在直线x+y-2=0的异侧;
④对2×2数表定义平方运算如下:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/5.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/6.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/7.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780019_ST/8.png)
其中真命题是
(将你认为的正确命题的序号都填上).
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(理) 已知点集
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780018_ST/0.png)
,其中
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780018_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183540428378034/SYS201310241835404283780018_ST/2.png)
,点P
n(a
n,b
n)∈L,P
1=L∩{(x,y)|x=1},且a
n+1-a
n=1,则数列{b
n}的通项公式为
.
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