题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-64963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-75105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-33518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-12463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-68413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034506-83547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034506-89097.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-83482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-75105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-96063.png)
所以四边形EDCB为菱形,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-14238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-12463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-68413.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-41942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034505-68413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-88081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-64185.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-48787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034507-65590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034508-72176.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034508-28530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034508-16352.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034452-12314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034452-12314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034453-24896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034453-27995.png)
(1)求证:直线PD⊥面ABCD;
(2)求二面角A-PB-D的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034446-60081.png)
A.AC⊥BD |
B.AC∥截面PQMN |
C.AC=BD |
D.异面直线PM与BD所成的角为45° |
A.平面PAC⊥平面ABC | B.平面PAB⊥平面PBC |
C.PB⊥平面ABC | D.BC⊥平面PAB |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034430-27194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034430-77484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034431-84331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034431-14633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034431-62584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034431-62302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034432-38172.png)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034432-69549.png)
(2) 求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034432-57057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034432-38172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034433-36907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034421-38987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034421-68044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034421-26945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034422-88461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034422-18687.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034422-14156.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034422-94841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106034423-69413.png)
最新试题
- 1古人写文章爱引用前人话语作为论据,如韩愈《师说》中“孔子曰:‘三人行, ’”,苏洵《六国论》中“古人云:‘以地
- 2本小题满分12分)青少年“心理健康”问题越来越引起社会关注,某校对高二600名学生进行了一次“心理健康”知识测试,并从中
- 3一个等腰三角形的一个外角等于110°,则这个三角形的顶角应该为______.
- 4青少年只有在党的领导下,坚持与时代同步伐,与祖国共命运,与人民齐奋斗,才能拥有壮丽的青春,才能实现人生的美好理想,这是因
- 5下列有关生态系统成分的叙述正确的是[ ]A.自养生物都属于生产者,如硝化细菌B.动物都属于消费者,如食草动物C.
- 6计算:(1)=( );(2)=( )。
- 7小刚同学说:“我爸爸说在他小时候,村边的小河里有许多鱼、虾,稻田中有不少黄鳝和泥鳅。现在河里和稻田中却几乎没有了”。这是
- 8张謇创办大生纱厂于[ ]A.1895年 B.1898年 C.1899年 D.1913年
- 9若函数f(x)=logax(0<a<1)在区间[a,2a]上的最大值是最小值的3倍,则a=______.
- 10 A middle-aged stranger visited us late on a da
热门考点
- 1计算:(3x2y)•(-2xy)-(-2x2y3)2÷(-4xy4).
- 2【题文】依次填入下面一段文字横线处的语句,衔接最恰当的一项是 一段文字或长或短,但其中蕴涵的情趣和内涵却是要用整个心灵去
- 3记载了孔子的言行,由他的弟子整理而成的书是[ ]A.《论语》B.《春秋》C.《史记》D.《道德经》
- 4根据下列事实,写出有关的化学方程式,并在括号里注明反应的基本类型(指:化合、分解、置换、复分解).(1)铁丝插入硫酸铜溶
- 5已知圆的方程为:,直线的方程为,点在直线上,过点作圆的切线,切点为.(1)若,求点的坐标;(2)若点的坐标为,过点的直线
- 6夏朝的都城据说是阳城,但是阳城在哪里,没有定论;商朝的都城最初也是搬来搬去的,后来商王盘庚将它稳定下来,都城在[
- 7如图,将两根钢条AA"、BB"的中点O连在一起,使AA"、BB"可以绕点O自由转动,就做成了一个测量工件,则A"B"的长
- 8Please call me _______ 8989766. [ ]A. in B. at C. abo
- 9根据语境按拼音写出汉字(3分)青春的记忆如风铃碰撞着我的心fēi ,青春的彩笛曾吹动我的梦想,青春的音fú
- 10A.用两根相同的轻弹簧沿竖直方向吊着一根质量为m、长为L的金属棒ab,ab处于水平方向、磁感强度为B的匀强磁场中,如图所