满分5 >
高中数学试题 >
在等差数列{an}中,首项a1=0,公差d≠0,若am=a1+a2+…+a9,则...
在等差数列{an}中,首项a1=0,公差d≠0,若am=a1+a2+…+a9,则m的值为( )
A.37
B.36
C.20
D.19
考点分析:
相关试题推荐
已知点A(-1,5)和向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008002_ST/0.png)
=(2,3),若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008002_ST/1.png)
,则点B的坐标为( )
A.(7,4)
B.(7,14)
C.(5,4)
D.(5,14)
查看答案
若(1+2ai)i=1-bi,其中a、b∈R,i是虚数单位,则|a+bi|=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008001_ST/2.png)
D.
查看答案
已知全集U=R,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874600808/SYS201310251241488746008000_ST/0.png)
,则∁
UA=( )
A.[0,+∞)
B.(-∞,0)
C.(0,+∞)
D.(-∞,0]
查看答案
已知函数f(x)=lnx,g(x)=f(x)+ax
2+bx,函数g(x)的图象在点(1,g(1))处的切线平行于x轴.
(1)确定a与b的关系;
(2)试讨论函数g(x)的单调性;
(3)证明:对任意n∈N
*,都有ln(1+n)>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874599087/SYS201310251241488745990020_ST/0.png)
成立.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874599087/SYS201310251241488745990019_ST/0.png)
为常数),数列{a
n}满足:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874599087/SYS201310251241488745990019_ST/1.png)
,a
n+1=f(a
n),n∈N*.
(1)当α=1时,求数列{a
n}的通项公式;
(2)在(1)的条件下,证明对∀n∈N*有:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874599087/SYS201310251241488745990019_ST/2.png)
;
(3)若α=2,且对∀n∈N*,有0<a
n<1,证明:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874599087/SYS201310251241488745990019_ST/3.png)
.
查看答案