题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075902-50021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075903-76797.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075903-68078.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075903-92103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075903-53975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075904-99982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075904-27477.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075904-72359.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075904-60653.gif)
解析
核心考点
举一反三
如图,在四棱锥P—ABCD中,PA⊥底面ABCD,底面为直角梯形,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075852-94799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075852-35666.gif)
(Ⅰ)设M为PD的中点,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075853-39587.gif)
(Ⅱ)求侧面PAB与侧面PCD所成二面角的平面角的正切值.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-72199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-72199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-72199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-67169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-70351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075842-68422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075843-76052.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075843-51963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075843-21793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075843-38074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075844-36262.png)
(Ⅰ) 直线AB分别与平面α,β所成角的大小;
(Ⅱ)二面角A1-AB-B1的余弦值.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075829-24466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075829-86697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075830-57928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075829-24466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075830-49176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075830-83304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075830-24364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075831-25075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075831-84463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075818-55289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075818-48904.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075818-27729.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075818-48904.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075819-47151.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075819-71749.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075819-94088.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075819-35602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075819-79816.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075820-43558.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075820-29439.gif)
(Ⅱ)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075820-11566.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075820-91551.gif)
(Ⅲ)求凸多面体
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075821-95325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022075821-55282.gif)
最新试题
- 1A~D为短周期元素,其性质或结构信息如下表所示请根据表中信息回答下列问题: (1)A元素在元素周期表中的位置是_____
- 2— What time do you usually get up, Rick? — I usually get up
- 32002年春,上海市在进行取消统购粮后的城市新规划设计时,决定拿出三分之一的土地大搞植树造林。读下图,回答问题。小题1:
- 4阅读下面一首唐诗,然后回答问题。(6分)宿甘露寺 曾公亮枕中云气千峰近,床底松声万壑哀。要看银海拍天浪,开窗放入大江
- 5冬天手冷时,我们经常将两只手相互搓搓使手暖和,这是利用______的方式使手的内能增加;也可以用“暖手宝”焐手,这是利用
- 6下列命题中正确的是( )A.有限小数不是有理数B.无限小数是无理数有限小数不是有理数C.数轴上的点与有理数一一对应D.
- 7有下列四种溶液:A氢氧化钠溶液;B氢氧化钡溶液;C明矾溶液;D混有少量硝酸的硫酸镁溶液。若取其中的一种溶液(甲)逐滴加入
- 8已知室温时,0.1mo1/L某一元酸HA在水中有0.1%发生电离,下列叙述错误的是:[ ]A.该溶液的pH=4
- 9鉴别日常生活中的下列各组物质,其操作不正确的是( )A.氯化钠和碳酸钙粉末:加水B.水和双氧水:加入少量二氧化锰C.氮
- 10已知等差数列{an}的公差不为零,a1=25,且a1,a11,a13成等比数列.(1)求{an}的通项公式;(2)求a1
热门考点
- 1假设太阳系中天体的密度不变,天体直径和天体之间距离都缩小到原来的一半,地球绕太阳公转近似为匀速圆周运动,则下列物理量变化
- 2项王军壁垓下,兵少食尽,汉军及诸侯兵围之数重。夜闻汉军四面皆楚歌,项王乃大惊曰:“汉皆已得楚乎?是何楚人之多也!”项王则
- 3我们平时在“开灯”时,实际上就是开关______,“关灯”时,实际上就是将开关______.
- 4What to her yesterday evening? [ ]A.
- 5图是描述质点a、b、c、d做直线运动的速度图象和位移图象。根据图象,下列判断正确的是( ) A.a匀加速运动,b静止
- 6沙丘的成因是 A.流水侵蚀B.流水沉积C.风力侵蚀D.风力沉积
- 7功的原理告诉我们:使用任何机械都不能省功.如果把使用机械时我们总共做的功表示为W机械,把不用机械而直接用手做的功表示为W
- 8物体在恒力作用下作直线运动,在t1时间内物体的速度由零增大到v,F对物体做功W1,给物体冲量I1.若在t2时间内物体的速
- 9请联系光合作用、呼吸作用以及生物圈中碳一氧平衡的知识回答: (1)a、b表示植物的生理活动:a是___________
- 10在“等边三角形、正方形、等腰梯形、正五边形、矩形、正六边形”中,任取其中一个图形,恰好是四边形的概率是______.