题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225030-36037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225030-89958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-68643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-98486.jpg)
(1)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-35002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-59841.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-94667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-97417.png)
(3)在棱
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-51282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-78764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-29356.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-20027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-67393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-52145.png)
解析
试题分析:(1)以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-14601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-51652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-26453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225035-64918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-35002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-59841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225035-93667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-20027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225035-30808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225035-15633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-30105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-39404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-75312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-46091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225037-81810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-78764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
试题解析:
(1)以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225034-14601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225037-82798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225037-29927.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225037-28920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225037-18835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225038-19885.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225038-87563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-35002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225031-59841.png)
(2) 连接
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225038-17322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225038-44888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225039-47405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225039-11989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225039-42306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225038-87563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225039-88688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-80754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-78580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-37058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-10110.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-94667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-88607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225041-94452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225041-52255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225041-93208.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225041-46104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225042-68708.png)
(3) 假设在棱上存在一点
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-30105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-39404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225036-75312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225040-88607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225042-58127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225041-52255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225042-39771.png)
要使
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225042-89517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225042-63760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225043-59877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225043-28922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225032-78764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-46274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225033-48370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225043-39072.png)
核心考点
试题【在长方体中,为线段中点.(1)求直线与直线所成的角的余弦值;(2)若,求二面角的大小;(3)在棱上是否存在一点,使得平面?若存在,求的长;若不存在,说明理由.】;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/20191020/20191020225024-45139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225024-83921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225024-55013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225025-15447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225025-56917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225025-72562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225025-35106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020225014-67237.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224957-19784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224958-39091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224958-36217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224958-82734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224958-48534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224958-67898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224959-88554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224959-24569.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224959-50787.png)
(2)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224959-42725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224937-18171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224938-53514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224938-72543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224938-30132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224938-19992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224938-79320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224939-54178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224939-40753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224939-93960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224939-69832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224940-93792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224940-90098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224940-97604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224940-22063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224940-43983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224941-13206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224939-69832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224941-82254.jpg)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224941-97370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224942-64939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224942-64266.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224942-79200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020224942-11093.png)
A.![]() | B. 2 | C.4 | D.![]() |
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