题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005831-76364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-77405.gif)
的中点,
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-31463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-13981.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-62774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-71884.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005833-61668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-71884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005833-38832.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005833-43262.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005833-68419.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005834-70189.gif)
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005834-52685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005834-43099.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005834-45809.gif)
因为平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005831-76364.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-77405.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-50991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-46792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-71935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-77405.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-96780.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-11443.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005836-57823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-11443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005836-72707.gif)
在等腰三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005835-11443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005834-52685.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005836-36401.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005836-32906.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005836-18798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-62774.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-71884.gif)
(2)连AF交BE于Q,连QO.
因为E、F、O分别为边PA、PB、PC的中点,
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005837-68768.gif)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005837-94132.gif)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005837-78113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005837-56986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005837-52353.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005833-61668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005832-71884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005838-33473.gif)
解析
核心考点
试题【如图,平面平面,点E、F、O分别为线段PA、PB、AC的中点,点G是线段CO的中点,,.求证:(1)平面;(2)∥平面. 】;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/20191021/20191021005821-33213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005821-33213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005821-33213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005821-43606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005822-80031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005822-59800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005822-56479.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005822-77611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005822-71231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005823-45913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005823-20363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005818-10322.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005818-31331.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-84243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-75583.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-49548.gif)
(I)设CE与平面ABE所成的角为
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-38367.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-52681.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-92102.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-41097.gif)
(Ⅱ)在(I)和条件下,当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-41097.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005801-84836.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-33281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-18023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-60982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-62152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-33281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-62152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-18023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-60982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-76789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-77710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-33281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-77710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005752-18023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-77710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-62152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-96804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-77710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005753-60982.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-32110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-64165.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-11227.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-15589.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-10342.gif)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005739-66512.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-11478.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-72800.gif)
(Ⅱ)试证无论
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-73658.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-76480.gif)
恒为定值;
(Ⅲ)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-55694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021005740-80588.gif)
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