设有两个命题,p:关于x的不等式a
x>1(a>0,a≠1)的解集是{x|x<0};q:函数y=lg(x
2-x+a)的定义域为R,如果p∨q为真命题,为p∧q假命题,求实数a的范围.
考点分析:
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设数列{a
n}的前n项和为S
n,a
1=1,且对任意正整数n,点(a
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(1)a
2,a
3.
(2)数列{a
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(北京卷文15)已知函数f(x)=2cos2x+sin
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设等比数列{a
n}的前n和为S
n,若S
3=2,S
6=18,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165015_ST/0.png)
=
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已知|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165014_ST/0.png)
|=1,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165014_ST/1.png)
|=2,|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165014_ST/2.png)
|=2,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165014_ST/3.png)
|=
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在△ABC中,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102429882116581/SYS201311031024298821165013_ST/0.png)
,则角B的值为
.
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