满分5 >
高中数学试题 >
数列{an}中,a1=1,对于所有的n≥2,n∈N*都有a1•a2•a3•…•a...
数列{an}中,a1=1,对于所有的n≥2,n∈N*都有a1•a2•a3•…•an=n2,则a3+a4等于 .
考点分析:
相关试题推荐
在
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423009_ST/0.png)
和
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423009_ST/1.png)
之间插入三个数,使这五个数成等比数列,则插入的三个数的乘积为
.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/0.png)
=(-3,2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/1.png)
=(-1,0),向量(λ
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/3.png)
)⊥(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/4.png)
-2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224802344242354/SYS201311012248023442423008_ST/5.png)
),则实数λ的值为
.
查看答案
设等差数列{a
n}的前n项和为S
n,若a
1=-17,a
4+a
6=-10,则当S
n取最小值时,n的值为
.
查看答案
已知命题p:∀x∈[1,2],x
2-a≥0;命题q:∃x∈R,x
2+2ax+2-a=0,若命题“p且q”是真命题,则实数a的取值范围为
.
查看答案