满分5 >
高中数学试题 >
已知某样本的频率分布直方图如图所示,样本组距是相等的,则组距是( ) A.0.1...
已知某样本的频率分布直方图如图所示,样本组距是相等的,则组距是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865002_ST/images0.png)
A.0.1
B.1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865002_ST/0.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865002_ST/1.png)
考点分析:
相关试题推荐
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865001_ST/0.png)
(i为虚数单位),且b>0,则复数z在复平面内所对应的点位于( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限
查看答案
已知集合M={x|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865000_ST/0.png)
},N={x|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968886528/SYS201310241826329688865000_ST/1.png)
},则C
R(M∪N)等于( )
A.{x|x≤1}
B.{x|x≥1}
C.{x|x<1}
D.{x|x>1}
查看答案
已知函数f(x)=2x+1.
(I)解不等式
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627023_ST/0.png)
;
(II)若x≠0,求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627023_ST/1.png)
.
查看答案
直线l方程是x+2y+3=0,曲线C的极坐标方程是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627022_ST/0.png)
.
(1)分别求直线l和曲线C的参数方程;
(2)求直线l和曲线C交点的直角坐标.
查看答案
如图,⊙O与⊙P相交于A、B两点,圆心P在⊙O上,⊙O的弦BC切⊙P于点B,CP及其延长线交⊙P于D,E两点,过点E作EF⊥CE,交CB的延长线于点F.
(I)求证:四点B、P、E、F共圆;
(II)若CD=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627021_ST/0.png)
,求出由四点B、P、E、F所确定圆的直径.
查看答案