四棱锥A-BCDE中,底面BCDE为矩形,侧面ABC⊥底面BCDE,BC=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020017_ST/0.png)
,AB=AC.
(Ⅰ)证明:AD⊥CE;
(Ⅱ)设CE与平面ABE所成的角为45°,求二面角C-AD-E的大小.
考点分析:
相关试题推荐
某大学2009届入学测试中,要求每位考生在10道题中随机抽出2道题回答.
(I) 现在某位考生会答10道题中的6道,求这个考生答错题目个数的分布列和数学期望;
(II)若答对其中一题即为及格,如果某位考生及格的概率小于
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020016_ST/0.png)
,那么他最多会几道题?
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/0.png)
sin(ωx-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/1.png)
)-cos(ωx-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/2.png)
)(ω>0)图象的两相邻对称轴间的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/3.png)
.
(I)求f(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/4.png)
)的值;
(II)将函数y=f(x)的图象向右平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/5.png)
个单位后,得到函数y=g(x)图象,求g(x)在区间[0,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020015_ST/6.png)
]上的单调性.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020014_ST/0.png)
,若[m]表示不超过m的最大整数,则函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020014_ST/1.png)
的值域是
.
查看答案
已知A,B,C,D在同一个球面上,AB⊥平面BCD,BC⊥CD,若AB=6,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020013_ST/0.png)
,AD=8,则B,C两点间的球面距离是
.
查看答案
若椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020012_ST/0.png)
上横坐标为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338007602083/SYS201311012313380076020012_ST/1.png)
的点到左焦点的距离大于它到右准线的距离,则椭圆离心率e的取值范围是
.
查看答案