题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-76451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-70864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-98454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-34721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-50477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-64389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-26864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-45223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-34721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-75386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-90518.jpg)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-64804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081232-27230.png)
答案
解析
试题分析:(Ⅰ)证明:∵点
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-26864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-45223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-34721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-75386.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081232-51167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081232-62513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081232-58496.png)
∵四边形
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-76451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081232-38874.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-30745.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-86295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-63114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081231-64804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
(Ⅱ)证明:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-50477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-64389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-73963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-64389.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-79093.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-70864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081229-79355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081233-73963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081230-64389.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-75507.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-48896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-46497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-77809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081235-26625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-77809.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081235-86935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081234-77809.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081235-96137.png)
点评:要证明线线、线面、面面的位置关系,要紧扣判断定理和性质定理,要把定理中要求的条件一一列举出来,缺一不可.
核心考点
试题【(本小题共12分)如图,四边形是矩形,平面,是上一点,平面,点,分别是,的中点. (Ⅰ)求证:平面;(Ⅱ)求证:. 】;主要考察你对空间几何体的视图与直观图等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081220-42489.png)
(1)求证:AG∥平面PEC;
(2)求AE的长;
(3)求二面角E—PC—A的正弦值.(本题满分14分)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081217-55910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-53563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-65610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-76240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-30951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-44153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-76240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-72877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-37555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081208-83569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-49430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-65169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-89997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-80070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-52722.jpg)
(Ⅰ)求四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-91043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081209-39577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081210-76229.png)
(Ⅲ)求面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081210-52225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081210-37758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081159-95084.jpg)
A.![]() | B.2 | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081154-28528.jpg)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081154-58362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081155-79018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081155-55037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021081155-60017.png)
最新试题
- 1从对流层到高层大气,随着高度的升高,会发生哪些现象? ①气温逐渐降低 ②气压逐渐降低 ③空气密度逐渐减小 ④臭氧含
- 2某市2003年至2005年初中招生的统计如下图,根据图形回答下列问题:(1)这是一张___________统计图;(2)
- 32008年4月15日,中国食品产业网报道,液态奶市场自去年下半年掀起涨价风以来,首次出现降价促销,降幅最高的达到了20%
- 4下列事件发生的顺序排列正确的是①英国资产阶级革命 ②美国内战 ③法国大革命[ ]A.①②③ B.①③② C.②③
- 5设A1、A2、A3、A4、A5是空间中给定的5个不同的点,则使++++=0成立的点M的个数为________.
- 6等质量的SO2 和SO3[ ]A.所含氧原子的个数比为 2 : 3B.所含硫原子的个数比为 1 : 1 C.所含
- 7在密闭容器中,一定条件下,进行如下反应:NO(g)+CO(g)= 1/2N2(g) +CO2(g) △H ="-373.
- 8如图所示,N代表北极点,AN、BN为两条相对的经线,AC处于昼半球,C正好是晨昏圈与某一纬线圈的切点,图中数字代表纬度。
- 9在一块稻田生态系统里,有杂草、虫子、青蛙、田鼠等.直接或间接地为动物提供食物的成分是______,而虫子、青蛙、田鼠的作
- 10某中学七年级学生小刚今年13岁,属羊,小刚爷爷与他的年龄的和为86岁,你能算出小刚爷爷的年龄和属相吗?
热门考点
- 1已知双曲线的顶点到渐近线的距离为2,焦点到渐近线的距离为6,则该双曲线的离心率为( )。
- 2“火柴大王”刘鸿生回忆说“我在重庆办的中国毛纺织工业部,火柴原料厂及兰州办的毛纺厂,都有官僚资本的投资。我原来在上海是大
- 3“开心农场”是某网络公司开发的一款游戏,玩家可以网上种菜,也可以偷窃好友的菜。如今,不少城市白领都在郊区认领一块菜地,并
- 4已知函数f(x)=cosωx(3sinωx-cosωx)+1,(ω>0)的最小正周期是π,求函数f(x)的值域以及单调递
- 5速度是描述物体运动快慢的物理量,物理学中比较运动的快慢有统一的标准,即物体发生的 与
- 6生物圈的构成是( )A.动物和植物B.海洋和原野C.生物及其生存环境D.地球及陆生生物
- 7在一定温度下,向盛有硝酸钾饱和溶液的烧杯中加入硝酸钾固体后,则( )A.晶体质量减少B.晶体质量不变C.溶质质量分数增
- 8—What was it that________the terrible accident? —His driving
- 92011年我国国内生产总值为471564亿元,比上年增长9.2%。这表明我国经济建设又迈上了一个新台阶。我国取得这一成绩
- 10张衡发明的地动仪是世界公认的最早的地震仪器。地动仪发明于( )A.东汉B.唐朝C.明朝D.清朝