题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020114-17557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020114-70154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020114-66721.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020114-58168.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020114-12457.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020115-32908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020115-83672.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020115-74929.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020115-24623.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020115-77429.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020116-32116.gif)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020116-15740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020116-50790.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020116-55319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020116-25072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020117-28551.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020117-99068.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020102-52945.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020102-93258.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020050-13607.jpg)
如图5所示,四棱锥P-ABCD的底面ABCD是半径为R的圆的内接四边形,其中BD是圆的直径,∠ABD="60°," ∠BDC=45°,PD垂直底面ABCD,PD=
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020033-54550.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020034-41104.gif)
(1)求BD与平面ABP所成角θ的正弦值;
(2)证明:△EFG是直角三角形;
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020034-21923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020034-93237.jpg)
如图,已知点P在正方体ABCD-
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020019-78228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020019-18845.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020020-45143.gif)
(Ⅰ)求DP与
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020020-55557.gif)
(Ⅱ)求DP与平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020020-13852.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020020-73370.jpg)
三棱锥被平行于底面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-44431.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-40991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-50584.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-11398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-44431.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-10438.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-96549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020002-69987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-36310.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-87360.gif)
(Ⅰ)证明:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-37825.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-76232.gif)
(Ⅱ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-91115.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022020003-65625.jpg)
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