已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699016_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699016_ST/1.png)
=1(a>0,b>0)和椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699016_ST/2.png)
有相同的焦点,且双曲线的离心率是椭圆离心率的两倍,求双曲线的方程.
考点分析:
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设函数f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699015_ST/0.png)
(x>0),观察:
f
1(x)=f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699015_ST/1.png)
,
f
2(x)=f(f
1(x))=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699015_ST/2.png)
,
f
3(x)=f(f
2(x))=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699015_ST/3.png)
,
f
4(x)=f(f
3(x))=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699015_ST/4.png)
,
…
根据以上事实,由归纳推理可得:
当n∈N
*且n≥2时,f
n(x)=f(f
n-1(x))=
.
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已知命题:p:(x-3)(x+1)>0,命题q:x
2-2x+1-m
2>0(m>0),若命题p是命题q的充分不必要条件,则实数m的范围是
.
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已知双曲线C
1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699013_ST/0.png)
与双曲线C
2:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699013_ST/1.png)
有相同的渐近线,且C
1的右焦点为F(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334769921/SYS201311031027563347699013_ST/2.png)
,0).则a=
,b=
.
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函数f(x)=lnx-x在区间(0,e]的最大值为( )
A.1-e
B.-1
C.-e
D.0
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