题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-69855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-12543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-28802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-64798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-73256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-24022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-21871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-38374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-27369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-61814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-67342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-97428.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-74966.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-51179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-78105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-10777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-96625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-55481.png)
∵三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063234-69855.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-37657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-19587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-63313.png)
过
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063236-78105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063237-41752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063237-82234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063237-99741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063237-64294.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063237-98287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063238-52293.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063238-13416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063238-86704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063238-37212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-94251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-56560.png)
而二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-27369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063238-52293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-27369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-39756.png)
设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-23053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-67342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-21358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063240-13012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063240-37076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063240-33230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063240-41387.png)
∵点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063240-54446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063241-85044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-61814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-67342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-23053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-67342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063241-98729.png)
方法二:建立如图所示直角坐标系
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063241-51875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063241-60010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063242-49909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063242-29981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063242-60788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063242-46534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063242-75462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063243-88446.png)
向量
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063243-56122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063243-38776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063243-30198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063244-38356.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063244-38517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063244-84492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063244-36643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063245-80810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063245-87909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063244-84492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063245-23348.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063245-18023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-27369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-27369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063239-39756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063245-82160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-61814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063235-67342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063246-69908.png)
核心考点
举一反三
已知四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063218-30970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063218-11523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063218-39133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063219-58120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063219-26580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063219-37157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063219-33099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063220-63137.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063220-97310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063218-11523.png)
(Ⅱ)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063220-24712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063220-86328.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063221-51017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063220-24712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063221-33031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063221-28772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063221-37002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063214-46596.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063205-17005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063205-23351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063205-91361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063205-62315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063206-54325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063206-59275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063206-15079.png)
的中点.(1)当E为PD的中点时,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063206-81784.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063207-19093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063207-74776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-28283.png)
(1)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-83791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-14369.png)
(2)M为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-89440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-56917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-30988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063201-83791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063202-77937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063202-29546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063150-65401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063150-82790.png)
现将
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063150-65401.png)
(I)试判断直线AB与平面DEF的位置关系,
并说明理由;(II).求二面角E-DF-C的余弦值;
(III)在线段BC是否存在一点P,但AP
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063150-90381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022063150-80665.jpg)
最新试题
- 1如图,带电平行板长为L,极板间距离为d,将电子(质量为m、电量为-e)在两板中央以速度v0垂直电场方向射入,飞出电场时侧
- 2中国是一个幅员辽阔的大国,由于历史、地理的原因而形成了许多地方方言区域,但从古到今,使用汉语和各方言区域都使用汉字。中国
- 3读图,并回答问题:(14分) (1)1998年G河流域再一次发生特大洪灾,造成直接经济损失1000多亿元人民币。但人们
- 4杂技演员有高超的技术,能轻松地顶接从高处落下的坛子.关于他顶坛时头顶受到的压力,产生的直接原因是( )A.坛的形变B.
- 5 若,且≥2,则( )A.有最小值B.有最大值1 C.有最大值2D.有最小值
- 6如图,AB是⊙O的直径,弦BC=4cm,F是弦BC的中点,∠ABC=60°.若动点E以2cm/s的速度从A点出发沿着A→
- 7如图,分别以正方形ABCD的四条边为直径画半圆,重叠部分如图中阴影区域。(1)若向该正方形内随机投一点,求该点落在阴影区
- 8阅读文言文,回答问题。【甲】黔之驴 黔无驴,有好事者船载以入。至则无可用,放之山下。虎见之,庞然大物也,以为神。蔽林间
- 9如图,在△ABC中,∠B=40 °,∠BCD=100 °,CE平分∠ACB,则∠A=( )度,∠ACE=(
- 10已知,则xyz=( )
热门考点
- 1开辟新航路引发的贸易路线的转移,西欧国家可以( )①向东由小亚细亚到达东亚 ②向南绕非洲大陆南端至东方③
- 2牛顿是一个博学的科学家,他在很多领域都取得过划时代的成就,其中最重要的是[ ]A.数学 B.天文学
- 3设F1、F2是双曲线x2-y24=1的左、右两个焦点,若双曲线右支上存在一点P,使(OP+OF2) •F2P=0(O为
- 4南非的一条河流中沙金含量较多,许多人在河中淘金,其中收获较大的人应在河流的( )A.南岸B.北岸C.左岸D.右岸
- 5货币的本质是什么?货币的本质通过货币的基本职能表现出来,货币有哪些基本职能?(6分)
- 6江苏省教育厅公布的2013年学生体质健康调查结果显示,学生近视率仍维持在高位水平,且越来越低龄化,请根据下表所提示的内容
- 7 If you do not use your arms or your legs for some time, th
- 8下列不属于无性生殖的是( )A.水螅的出芽生殖B.利用植物的开花结果生殖C.依靠植物的根、茎、叶生殖新个体D.利用植物组
- 9现代西方学者用三个“G”来概括新航路开辟的动机,即上帝(God)、荣誉(Glory)和黄金(Gold)。对此理解正确的是
- 10下列解释事实的离子方程式正确的是 A.铁和稀硝酸反应制得浅绿色溶液:Fe+ 4H+ + NO3-Fe3+ + NO↑+