已知数列{a
n}的前n项和为S
n=n
2+n.
(I)求数列{a
n}的通项公式;
(II)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704016_ST/0.png)
,求数列{b
n}的前n项和T
n.
考点分析:
相关试题推荐
已知命题p:“直线y=kx+1椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704015_ST/0.png)
恒有公共点”命题q:只有一个实数x满足不等式x
2+2ax+2a≤0.若命题“p或q”是假命题,求实数a的取值范围.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704014_ST/0.png)
,其中a,b∈R,若曲线y=f(x)在点P(2,f(2))处的切线方程为y=3x+1,求函数f(x)的解析式.
查看答案
设椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/0.png)
上一点P到左准线的距离为10,F是该椭圆的左焦点,若点M满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/1.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/2.png)
(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/3.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/4.png)
),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704013_ST/5.png)
=
.
查看答案
将长为L的木棒随机地折成3段,则3段构成三角形的概率是
.
查看答案
P为椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224709129870416/SYS201311012247091298704011_ST/0.png)
上一点,F
1、F
2是椭圆的左、右焦点,若使△F
1PF
2为直角三角形的点P共有8个,则椭圆离心率的取值范围是
.
查看答案