在△ABC中,A,B,C所对的边分别为a,b,c,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217017_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217017_ST/1.png)
,
(1)求C;
(2)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217017_ST/2.png)
,求a,b,c.
考点分析:
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在数列{a
n}中,如果对任意的n∈N
*,都有
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/0.png)
(λ为常数),则称数列{a
n}为比等差数列,λ称为比公差.现给出以下命题,其中所有真命题的序号是
.
①若数列{F
n}满足F
1=1,F
2=1,F
n=F
n-1+F
n-2(n≥3),则该数列不是比等差数列;
②若数列{a
n}满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/1.png)
,则数列{a
n}是比等差数列,且比公差λ=2;
③等差数列是常数列是成为比等差数列的充分必要条件;
(文)④数列{a
n}满足:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/2.png)
,a
1=2,则此数列的通项为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/3.png)
-1,且{a
n}不是比等差数列;
(理)④数列{a
n}满足:a
1=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/4.png)
,且a
n=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/5.png)
,则此数列的通项为a
n=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101431417521780/SYS201311031014314175217016_ST/6.png)
,且{a
n}不是比等差数列.
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f′(x)是定义域为R的函数f(x)的导函数,若f′(x)-f(x)<0,若a=e
2012f(0)、b=e
2011f(1)、c=e
1000f(1012),则a,b,c的大小关系是
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已知S、A、B、C是球O表面上的点,SA⊥平面ABC,AB⊥BC,SA=AB=1,BC=
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,则球O的表面积等于
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已知圆C的圆必是抛物线
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的焦点.直线4x-3y-3=0与圆C相交于A,B两点,且|AB|=8,则圆C的方程为
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已知定义在R上的函数f(x)满足f(1)=1,f(1-x)=1-f(x),2f(x)=f(4x),且当0≤x
1<x
2≤1时,f(x
1)≤f(x
2),则f(
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)等于( )
A.
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B.
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C.
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D.
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