如图在棱锥
中,
为矩形,
面
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f860cf564d3d92e58ea41cdb53ac2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/d2e556f7-74e1-419a-bba4-e9977b859136.png?resizew=145)
(1)在
上是否存在一点
,使
面
,若存在确定
点位置,若不存在,请说明理由;
(2)当
为
中点时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f860cf564d3d92e58ea41cdb53ac2d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/d2e556f7-74e1-419a-bba4-e9977b859136.png?resizew=145)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502f49e759b623b5c3a8b901bb9882cc.png)
18-19高三下·吉林·阶段练习 查看更多[4]
【全国百强校】吉林省实验中学2019届高三下学期第八次月考数学(理)试题2019届甘肃省天水市第一中学高三下学期第七次模拟(最后一模)数学(理)试题(已下线)提升套餐练05-【新题型】2020年新高考数学多选题与热点解答题组合练(已下线)冲刺卷05-决战2020年高考数学冲刺卷(山东专版)
更新时间:2019-04-10 12:49:44
|
【知识点】 面面角的向量求法
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在三棱柱
中,
平面
.点E是棱
的中点,已知
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/4/2628677695496192/2632357491474432/STEM/f1ddb64e-92b7-45a2-bd71-9133a41293d7.png?resizew=278)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6509ec857ea52888dda7bb3331fa57c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca06399cdf3e783cc60c0bae8713ffe.png)
![](https://img.xkw.com/dksih/QBM/2021/1/4/2628677695496192/2632357491474432/STEM/f1ddb64e-92b7-45a2-bd71-9133a41293d7.png?resizew=278)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cbd2557ef69775b5a883c510091985.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在三棱柱
中,侧棱AA1⊥底面ABC,
,D为AC的中点.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951134012891136/2952605117882368/STEM/a9b07750-9b62-43e9-b362-8c262fa920cc.png?resizew=172)
(1)求证:
∥平面
;
(2)若
,求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951134012891136/2952605117882368/STEM/a9b07750-9b62-43e9-b362-8c262fa920cc.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d60aaf524b4c2eec5229f9f204ce51.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,在三棱锥
中,
,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/b2f9b759-73a4-4bd2-8462-bf0ebfc7188e.png?resizew=193)
(1)证明:
平面
;
(2)若点D在线段AC上,直线PD与直线BC所成的角为
,求平面DBP与平面CBP夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd3eb538f36e6e722e4ce125266b99b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/b2f9b759-73a4-4bd2-8462-bf0ebfc7188e.png?resizew=193)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若点D在线段AC上,直线PD与直线BC所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7ea65be0351e839d45d598dfb254b0.png)
您最近一年使用:0次