满分5 >
高中数学试题 >
若A为全体正实数的集合,R为实数集,B={-2,-1,1,2},则下列结论中正确...
若A为全体正实数的集合,R为实数集,B={-2,-1,1,2},则下列结论中正确的是( )
A.A∩B={-2,-1}
B.(∁RA)∪B=(-∞,0)
C.A∪B={0,+∞}
D.(∁RA)∩B={-2,-1}
考点分析:
相关试题推荐
若向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183951871/SYS201311031006471839518000_ST/0.png)
=(2,3),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183951871/SYS201311031006471839518000_ST/1.png)
=(5,6),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183951871/SYS201311031006471839518000_ST/2.png)
=( )
A.(-7,-9)
B.(7,9)
C.(-3,-3)
D.(3,3)
查看答案
定义在R上的函数f(x)>0,对任意x,y∈R都有f(x+y)=f(x) f(y)成立,且当x>0时,f(x)>1.
(1)求f(0)的值;
(2)求证f(x)在R上是增函数;
(3)若ff(3
x-9
x-2)<1对任意x∈R恒成立,求实数k的取值范围.
查看答案
已知函数f(x)=x
3-ax
2+10,
(I)当a=1时,求曲线y=f(x)在点(2,f(2))处的切线方程;
(II)在区间[1,2]内至少存在一个实数x,使得f(x)<0成立,求实数a的取值范围.
查看答案
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/0.png)
=(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/1.png)
sinx,cosx),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/2.png)
=(cosx,cosx),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/3.png)
=(2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/4.png)
,1).
(1)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/5.png)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/6.png)
,求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/7.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/8.png)
的值;
(2)若f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/9.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/10.png)
,求f(x)最小正周期及f(x)在(0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929018_ST/11.png)
]的值域.
查看答案
已知某厂生产x件产品的总成本为f(x)=25000+200x+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100647183792912/SYS201311031006471837929017_ST/0.png)
(元).
(1)要使生产x件产品的平均成本最低,应生产多少件产品?
(2)若产品以每件500元售出,要使利润最大,应生产多少件产品?
查看答案