题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010627-92004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010627-31333.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010627-57088.png)
解析
试题分析:取
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010628-41814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010628-45368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010628-72166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010628-43201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010628-54644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010629-13561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010629-70309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010629-31333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010629-51530.png)
点评:本题考查异面直线所成角的大小,解题时要认真审题,仔细解答,注意余弦定理的合理运用.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010604-99348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010605-85749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010605-59241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010605-61264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010605-97919.jpg)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010605-48026.png)
(Ⅱ)求二面角A-PD-C的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010555-33030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010556-49274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010556-70213.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010545-17351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010545-25467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010545-58468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010545-56607.png)
(Ⅰ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010545-35474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010546-12533.png)
(Ⅱ)求二面角D-
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010546-55661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010519-63939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010519-92922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010519-63763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010520-80223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010520-48173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010520-13152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010520-40569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010520-97512.jpg)
(1)证明:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010521-78560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010521-97857.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010521-64124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-44512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-84933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-49369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-80827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-95754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010511-49369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010512-51058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022010512-80465.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
最新试题
- 1若命题“ax2-2ax-3>0不成立”是真命题,则实数a的取值范围是________.
- 2.已知奇函数f(x)满足f(-1)=f(3)=0,在区间[-2,0)上是减函数,在区间[2,+∞)是增函数,函数F(x)
- 3“没有适当形式的政权机关,就不能代表国家。”这表明[ ]A、国体决定政体,政体反映国体B、在相同阶级掌权的条件下
- 4下图是体内细胞与内环境之间的物质交换示意图,根据图完成下列问题:组织细胞的内环境又叫__________,是由[
- 5若,且、、三点共线,则的最小值为 .
- 6已知复数的实部为8,,则=_____________。
- 7“大洋一号”是我国一艘现代化的综合性海洋科学考察船,质量大约是5×105kg,它受到的重力是______N,当它在大洋中
- 8如图所示,画中的人出现了错误的判断。以下四幅光路中,能正确说明产生这一现象的原因的是( )
- 9你尝试过运用化学知识做家庭小实验吗?下列四个家庭实验方案中,实验肯定不能成功的是( )A.鸡蛋放入食醋中变成软壳蛋B.
- 10已知5gA与2gB恰好完全反应生成3gC和若干克D。若制取8gD,则需__________gA。
热门考点
- 1完形填空。 Guo Hua was late for class. When he came to the c
- 2用自来水配制的AgNO3溶液,会出现浑浊.过滤出沉淀,向其中加入稀HNO3沉淀不溶解,请你分析该沉淀的成份是______
- 3He gave us some ______ on how to learn a language.A.advice
- 4一般情况下,做一次人工呼吸,需要做几次心脏挤压( )A.1-2次B.4-5次C.8-10次D.15-20次
- 5改革开放后,我国新的劳动就业模式是①劳动者自主就业②市场调节就业③政府促进就业④免费提供就业[ ]A.①②③④B
- 6下列说法正确的是A.对物体做功,物体的内能一定增加B.汽油机在做功冲程中,机械能转化为内能C.对正在沸腾的水继续加热,水
- 7一个班集体,是由个性各异的人组成的。集体和个性的关系是:①个人的优点、特长越能够充分发挥,集体就越坚强、团结和优秀② 集
- 8下列过程中,不直接依赖细胞膜的流动性就能完成的是[ ]A.胰岛B细胞分泌胰岛素B.mRNA与游离核糖体的结合C.
- 9关于导体的电阻和电阻率,下列说法中正确的是A.由R=U/I可知,导体的电阻与导体两端电压成正比,与流过导体的电流成反比B
- 10图示法是我们学习历史的一种方法。下面对辽、西夏与北宋并立局面示意正确的 ( )