题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013820-74798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-86960.gif)
(2)求AC与面PAB所成角
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-72213.gif)
答案
解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-58482.gif)
取
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-16826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-26166.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013822-26054.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013822-51000.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013822-38957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013822-31061.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013823-61141.gif)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013823-69123.gif)
由(1)(2)可得
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013823-57279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013823-91132.gif)
(2)作
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013823-20059.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-16826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013824-79148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013824-96622.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013824-39104.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013824-38530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013825-30376.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013825-25143.gif)
设平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013825-82895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013825-32027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013826-43640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013826-63438.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013825-82895.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013821-72213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013826-23892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013826-65018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013826-66002.gif)
解析
核心考点
试题【(本题满分12分)如图所示,在矩形ABCD中,AB=4,AD=2,E是CD的中点,O为AE的中点,以AE为折痕,将△ADE向上折起,使D到P,且PC=PB(1)】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013817-67354.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013817-66815.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013817-99303.gif)
(1)证明:AE⊥BC;
(2)求直线PF与平面BCD所成的角.
在棱长为1的正方体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013807-37793.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013807-55710.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013808-98689.gif)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013808-20230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013808-77372.gif)
(2)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013808-34473.gif)
(3)求三棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013809-64631.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013809-54239.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013802-38763.gif)
如图,在直三棱柱ABC—A1B1C1中,AC=1,AB=
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013802-61741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013802-59035.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013802-61741.gif)
(I)求证:A1B⊥B1C;
(II)求二面角A1—B1C—B的大小。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013803-54208.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-65914.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-15995.gif)
(Ⅰ)试证:AB
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-65914.gif)
(Ⅱ)设PA=k ·AB,若平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-11082.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-54344.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013752-57279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013734-93158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013734-89539.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013735-81461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013735-92045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013735-78108.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013735-35401.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013735-54627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013736-78139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013736-98815.gif)
(Ⅰ)证明:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013736-41742.gif)
(Ⅱ)求异面直线AB与MD所成角的大小;
(Ⅲ)求点B到平面OCD的距离。
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021013736-94597.gif)
最新试题
- 12010年9月6日,深圳隆重举行建立经济特区30周年庆祝大会。温家宝强调,经济特区30年来的实践充分表明,改革开放是决定
- 2下列关于钠原子和钠离子的说法正确的是( )A.Na比Na+稳定性B.Na得到一个电子变成Na+C.Na和Na+化学性质
- 3已知A,B,C,D,E,F均为前四周期元素,A元素的原子价电子排布为ns2np2,B元素的最外层电子数是其电子层数的3倍
- 4下列加点字注音有误的一项是 ( )A.舐
- 5某超市购进了一批不同价格的运动鞋,根据近几年统计的平均数据,运动鞋单价为40元,35元,30元,25元的销售百分率分别为
- 6下列化简,正确的是[ ]A.-(-3)=-3B.-[-(-10)]=-10C.-(+5)=5D.-[-(+8)]
- 7罗马征服从一个城邦到地跨三洲大帝国,罗马的发展史在欧洲和世界历史上写下极其重要的一页。阅读下列材料,回答问题:材料一
- 8在-23,-|-6|,-(-5),-32,(-1)2,-20%,0这7个数中,负数的个数为( )A.2个B.3个C.4
- 92009年3月1日16时13分,在安全飞行494天,绕月飞行5514圈后,___________卫星在北京航天飞行控制中
- 10晓明设计了一个自动测高仪,给出了四个电路,如图所示,R是定值电阻, R"是滑动变阻器其中能够实现身高越高,电压表示数越大
热门考点
- 1若x+y=3+22,x-y=3-22,则x2-y2等于( )A.1B.42C.6D.32
- 2He is never _________ class.A.arriveB.late forC.arrive lateD
- 3阅读下面的文字,完成1~4题。 快回家去!快回家去!拿着刚发下来的小学毕业文凭——红丝带子系着的白纸筒,催着自己,
- 4为了防止污染空气,下列各组物质不能同时倒入废液缸的是A.氯化钾和碳酸钠B.盐酸和氢氧化钠C.硫酸钠和氯化钡D.盐酸和高锰
- 5我国改革开放三十年,大力推进农村改革发展材料一:中国共产党十七届三中全会通过了《中共中央关于推进农村改革发展若干重大问题
- 6As a rule, domestic servants doing odd jobs are paid ______.
- 7读某地等高线地形图(单位:m),完成小题。小题1:导致图中铁路线弯曲的主导因素有( )A.避开河谷 B.避开山脊C.联
- 8(1)12+3113-(513+2348); (2)12+1-8+(12)-1-(3-2)0.
- 9博才中学要从甲、乙两名同学中选拔一名同学代表学校参加“华罗庚金杯”数学竞赛活动。这两位活动同学最近四次的数学测验成绩如下
- 10“低碳经济、低碳生活”已成为社会发展和家庭生活的主流。下列做法符合“低碳”理念的是A.卫生纸代替手帕B.鼓励使用塑料袋C