满分5 >
高中数学试题 >
设复数z1=1-2i,z2=x+i(x∈R),若z1•z2为实数,则x= .
设复数z1=1-2i,z2=x+i(x∈R),若z1•z2为实数,则x= .
考点分析:
相关试题推荐
函数f(x)=log
2(-x
2-2x+3)的值域为
.
查看答案
过抛物线y
2=2px(p>0)的焦点F的直线l与抛物线在第一象限的交点为A,与抛物线的准线的交点为B,点A在抛物线准线上的射影为C,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174009_ST/0.png)
,则抛物线的方程为( )
A.y
2=4
B.y
2=8
C.y
2=16
D.
查看答案
已知a
n=log
n+1(n+2)(n∈N
*)我们把使乘积a
1•a
2•a
3…a
n为整数的数n叫做“成功数”,则在区间(1,2012)内的所有成功数的和为( )
A.1024
B.2003
C.2026
D.2048
查看答案
函数f(x)=x
3+x,x∈R,当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174007_ST/0.png)
时,f(msinθ)+f(1-m)>0恒成立,则实数m的取值范围是( )
A.(0,1)
B.(-∞,0)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174007_ST/1.png)
D.(-∞,1)
查看答案
已知双曲线中心在原点且一个焦点为F(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/0.png)
,0),直线y=x-1与其相交于M、N两点,MN中点的横坐标为-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/1.png)
,则此双曲线的方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/2.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/3.png)
=1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/4.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/5.png)
=1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/7.png)
=1
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/8.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187817446/SYS201311031023541878174006_ST/9.png)
=1
查看答案