若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264010_ST/0.png)
的展开式中x
4的系数为7,则实数a=
.
考点分析:
相关试题推荐
若函数f(x)=x
3+ax
2+bx+c有极值点x
1,x
2,且f(x
1)=x
1,则关于x 的方程3(f(x))
2+2af(x)+b=0的不同实根个数是( )
A.3
B.4
C.5
D.6
查看答案
在平面直角坐标系中,O是坐标原点,两定点A,B满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/1.png)
=2,则点集{P|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/3.png)
,λ、μ∈R}所表示的区域面积是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264008_ST/6.png)
D.
查看答案
函数y=f(x)的图象如图所示,在区间[a,b]上可找到n(n≥2)个不同的数x
1,x
2,…,x
n,使得
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264007_ST/0.png)
=…=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264007_ST/1.png)
,则n的取值范围是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264007_ST/images2.png)
A.{3,4}
B.{2,3,4}
C.{3,4,5}
D.{2,3}
查看答案
在极坐标系中圆ρ=2cosθ的垂直于极轴的两条切线方程分别为( )
A.θ=0(ρ∈R)和ρcosθ=2
B.θ=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264006_ST/0.png)
(ρ∈R)和ρcosθ=2
C.θ=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264006_ST/1.png)
(ρ∈R)和ρcosθ=1
D.θ=0(ρ∈R)和ρcosθ=1
查看答案
已知一元二次不等式f(x)<0的解集为{x|x<-1或x>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124323822126426/SYS201310251243238221264005_ST/0.png)
},则f(10
x)>0的解集为( )
A.{x|x<-1或x>-lg2}
B.{x|<-1<x<-lg2}
C.{x|x>-lg2}
D.{x|x<-lg2}
查看答案