满分5 >
高中数学试题 >
设集合P={m|-1<m<0},Q={m∈R|mx2+4mx-4<0对任意实数x...
设集合P={m|-1<m<0},Q={m∈R|mx2+4mx-4<0对任意实数x恒成立},则下列关系中成立的是( )
A.P⊊Q
B.Q⊊P
C.P=Q
D.P∩Q=Q
考点分析:
相关试题推荐
已知x、y满足条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089006_ST/0.png)
则2x+4y的最小值为( )
A.6
B.-6
C.12
D.-12
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089005_ST/0.png)
=2(x>0,y>0),则xy的最小值是( )
A.12
B.14
C.15
D.18
查看答案
在一幢10米高的楼顶测得对面一塔吊顶的仰角为60°,塔基的俯角为45°,那么这座塔吊的高是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089004_ST/2.png)
D.
查看答案
在△ABC中,角A、B、C所对应的边分别为a、b、c,若角A、B、C依次成等差数列,且a=1,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/0.png)
等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101601951508920/SYS201311031016019515089003_ST/3.png)
D.2
查看答案
设α,β是方程x
2-2x+k
2=0的两根,且α,α+β,β成等比数列,则k=( )
A.2
B.4
C.±4
D.±2
查看答案