题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-60013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-80881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-33308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-90873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-80881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-16050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-44531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-59107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-22387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-80881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-30399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-49319.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-69693.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-88256.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-28045.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-73215.png)
⑤
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-98531.png)
答案
解析
试题分析:由①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-69693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-16050.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-33308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-22387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-88256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-17319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-22387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-11474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-90873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-11474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-23032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-23032.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024859-28045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024857-22387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024856-90873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024900-57351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024901-29521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024901-63153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024858-87520.png)
核心考点
试题【如图,直线平面,垂足为,直线是平面的一条斜线,斜足为,其中,过点的动直线交平面于点,,则下列说法正确的是___________.①若,则动点B的轨迹是一个圆;②】;主要考察你对向量与空间位置关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024839-16852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024839-63505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024840-33790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024840-65005.jpg)
(Ⅰ)当点M是EC中点时,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024840-49117.png)
(Ⅱ)当平面BDM与平面ABF所成锐二面角的余弦值为
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024841-80500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024833-44527.png)
A.MN与CC1垂直 | B.MN与AC垂直 | C.MN与BD平行 | D.MN与A1B1平行 |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024818-81239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024818-37137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024818-54523.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024819-71769.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024819-94317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024819-26745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024819-84907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024820-98976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024809-59842.png)
A.若a⊥c,b⊥c,则a∥b或a⊥b |
B.若![]() ![]() ![]() ![]() |
C.若a![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.若a⊥![]() ![]() ![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-73116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-87585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-32861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-79696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-73116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-32019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-79696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-34885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-12293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-65317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-36921.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-61452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024759-11092.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024800-29072.png)
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