已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650017_ST/0.png)
;
(1)证明:函数f(x)在(-1,+∞)上为减函数;
(2)是否存在负数x
,使得
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650017_ST/1.png)
成立,若存在求出x
;若不存在,请说明理由.
考点分析:
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在△ABC中,a,b,c分别为角A,B,C的对边.已知
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.
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,求a+b的值.
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已知数列{a
n}中,S
n是其前n项和,若a
1=1,a
2=2,a
na
n+1a
n+2=a
n+a
n+1+a
n+2,且a
n+1a
n+2≠1,则a
1+a
2+a
3=
,S
2010=
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过双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650013_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650013_ST/1.png)
上,则双曲线的离心率为
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如果点P在平面区域
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224525478465000/SYS201311012245254784650012_ST/0.png)
上,点Q在曲线x
2+(y+2)
2=2上,那么|PQ|的最小值为
.
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