满分5 >
高中数学试题 >
已知集合A={1,2,3,4,5},B={(x,y)|x∈A,y∈A,x-y∈A...
已知集合A={1,2,3,4,5},B={(x,y)|x∈A,y∈A,x-y∈A},则B中所含元素的个数为( )
A.3
B.6
C.8
D.10
考点分析:
相关试题推荐
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515021_ST/images0.png)
如图,已知OPQ是半径为1,圆心角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515021_ST/0.png)
的扇形,C是扇形弧上的动点,ABCD是扇形的内接矩形.记∠COP=α,求当角α取何值时,矩形ABCD的面积最大?并求出这个最大面积.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/0.png)
图象关于点B
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/1.png)
对称,点B到函数y=f(x)图象的对称轴的最短距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/2.png)
.
(1)求A,ω,ϕ的值;
(2)若0<θ<π,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515020_ST/3.png)
的值.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515019_ST/0.png)
.
(1)求f(x)的解析式.
(2)若x≥3求f(x)的最小值.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102756334951509/SYS201311031027563349515018_ST/0.png)
(1)求函数f(x)的最小正周期.
(2)求函数f(x)的单调减区间.
(3)求函数取最小值时x的值.
查看答案