满分5 >
高中数学试题 >
已知全集为R,若集合M={x|x-1≥0},N={x|2x+1>0},则(∁RM...
已知全集为R,若集合M={x|x-1≥0},N={x|2x+1>0},则(∁RM)∩N= .
考点分析:
相关试题推荐
设数列{a
n}(n=1,2,…)是等差数列,且公差为d,若数列{a
n}中任意(不同)两项之和仍是该数列中的一项,则称该数列是“封闭数列”.
(1)若a
1=4,d=2,求证:该数列是“封闭数列”;
(2)试判断数列a
n=2n-7(n∈N
*)是否是“封闭数列”,为什么?
(3)设S
n是数列{a
n}的前n项和,若公差d=1,a
1>0,试问:是否存在这样的“封闭数列”,使
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041022_ST/0.png)
(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041022_ST/1.png)
+…+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041022_ST/2.png)
)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041022_ST/3.png)
;若存在,求{a
n}的通项公式,若不存在,说明理由.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041021_ST/0.png)
(1)判断并证明y=f(x)在x∈(0,+∞)上的单调性;
(2)若存在x
,使f(x
)=x
,则称x
为函数f(x)的不动点,现已知该函数有且仅有一个不动点,求a的值,并求出不动点x
;
(3)若f(x)<2x在x∈(0,+∞)上恒成立,求a的取值范围.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/0.png)
是x,y轴正方向的单位向量,设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/1.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/3.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/4.png)
,且满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/5.png)
.
(1)求点P(x,y)的轨迹方程;
(2)过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/6.png)
的直线l交上述轨迹于A,B两点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041020_ST/7.png)
,求直线l的方程.
查看答案
在△ABC中,a、b、c是∠A、∠B、∠C的对边,已知∠B=45°,∠C=60°,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182948922404115/SYS201310241829489224041018_ST/0.png)
,求△ABC的面积S
△ABC.
查看答案