题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081723-16792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081723-47542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-99843.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081723-47542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-61500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-15983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-82197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-39167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-67713.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-82197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-36402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-68199.gif)
(1) 求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-24507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-34715.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-14811.gif)
(2)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-39167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
证明:(1)由题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-68199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-82197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-44894.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-52447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081728-50840.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081728-74094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081723-47542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081728-42201.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081728-74982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081729-39935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081729-97980.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081729-77997.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081729-93458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-77396.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
∴平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-24507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-14811.gif)
(2)∵
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-39167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081725-82197.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-39167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-70587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-15581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-68199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-58347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-70587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081730-23802.gif)
∵在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081731-63273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081731-70582.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-68199.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-36402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081731-30594.gif)
则点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081726-39167.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081727-72578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081731-10816.gif)
(其它方法可参照上述评分标准给分)
答案
解析
核心考点
试题【(理)(本小题8分)如图,在四棱锥中,底面是矩形, 平面,,,以的中点为球心、为直径的球面交于点.(1) 求证:平面平面;(2)求点到平面的距离. 证明:(1】;主要考察你对线线角等知识点的理解。[详细]
举一反三
如图,在四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081714-35628.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081714-43391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081714-53835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081714-61207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081715-49241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081715-65140.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081715-49645.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081715-66453.gif)
(2)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-91233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-16706.gif)
证明:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-67110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081714-53835.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-68437.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-88428.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081717-40744.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081717-88193.gif)
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-91233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-16706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081717-38362.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081717-10306.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081718-96065.gif)
求得
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081718-59256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-91233.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081716-16706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081718-82291.gif)
(其它方法可参照上述评分标准给分)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081658-15177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081659-37601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081659-58171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081659-69589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081700-99110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081700-40156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081700-38440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081700-11511.gif)
(1)求证:直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081700-17633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081701-91161.gif)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081701-77316.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081654-29424.gif)
如图,在正四棱柱ABCD-A1
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081655-62471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081655-24289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081655-95061.gif)
(I)求直线B1D和平面A1ADD1所成角的大小;
(II)求证:B1D⊥AE.
如图,四面体ABCD中,O是BD的中点,ΔABD和ΔBCD均为等边三角形,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081650-22122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081651-80951.gif)
(I)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022081651-53215.gif)
(II)求二面角A-BC- D的正切值.
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