题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-46127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-42590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-70314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-97350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-73840.png)
B.直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-78942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-15491.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-56185.png)
D.设二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-30539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-87952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-52745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-53933.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-32105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-73840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034358-78942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-15491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-24593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-74318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-33100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-44785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034400-39630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-56185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-30539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034400-20937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034400-38615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034359-74318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034400-87262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034400-14775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034401-54479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034401-30289.png)
核心考点
试题【已知正方体中,线段上(不包括端点)各有一点,且,下列说法中,不正确的是( )四点共面B.直线与平面所成的角为定值C.D.设二面角的大小为,则的最小值为】;主要考察你对线线角等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034342-52282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034342-82636.png)
为线段
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034343-28828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034343-24074.jpg)
(1)当E为线段BC中点时,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034343-19594.png)
(2)求证:平面AEF
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034343-74284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034344-71883.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034344-98920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034344-91690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034337-64067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034337-24159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034337-86370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034337-82207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034338-39995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034338-58842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034338-20135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034338-16313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034338-78204.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034331-66541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-71392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-33158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-33158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-87585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-33158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034333-70430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-33158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034333-85673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-16684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034333-70430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034332-28585.png)
其中正确命题的个数是
A.1个 | B.2个 | C.3个 | D.4个 |
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034316-86841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034316-73637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034316-92320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034316-16000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034316-32033.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034317-85394.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034317-85928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034317-18814.png)
(3)在
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034317-32532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034318-78813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034318-48046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034302-78916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034302-32627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034302-94813.png)
(1)若PA=PD,求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022034303-14884.png)
(2)点M在线段上,PM=tPC,试确定实数t的值,使PA//平面MQB.
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