名校
1 . 如图,在几何体
中,平面
平面
,四边形
为菱形,且
,
,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880868863131648/1882648412741632/STEM/05b5e74f2df04ffdaccfd989dbe0f6ba.png?resizew=238)
(1)求证:
平面
;
(2)求二面角
的平面角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90101de7db431b9632452fb694622379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880868863131648/1882648412741632/STEM/05b5e74f2df04ffdaccfd989dbe0f6ba.png?resizew=238)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ade8233bc5e455bc00825e081647519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bd9e6b1ef5ea610e0e9a2a4eff4a94.png)
您最近一年使用:0次
2018-02-15更新
|
970次组卷
|
3卷引用:2019届湖南省长沙市第一中学高三第八次月考数学(理)试题
名校
2 . 如图,在四棱锥
中,底面
为梯形,平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5528310855c85b21a7b627208f551b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52623aef17583cfb3bbbe0f84e1979c.png)
为侧棱
的中点,且
.
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863277310517248/1864621339992064/STEM/879d41eecadc4db5aa97975df2fef02a.png?resizew=134)
(1)证明:
平面
;
(2)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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5528310855c85b21a7b627208f551b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d52623aef17583cfb3bbbe0f84e1979c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827d63fc436eac20adaf279d57b0ea1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058953fc3ed0af5ddd0a44ef687f2c8d.png)
![](https://img.xkw.com/dksih/QBM/2018/1/18/1863277310517248/1864621339992064/STEM/879d41eecadc4db5aa97975df2fef02a.png?resizew=134)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932a04304f2d4975955d4baabb2deeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
您最近一年使用:0次
2018-01-20更新
|
765次组卷
|
4卷引用:湖南省邵阳市邵东市第一中学2021-2022学年高二上学期期中数学试题
名校
解题方法
3 . 如图,在四棱锥P-ABCD中,PD⊥面ABCD,AD∥BC,CD=13,AB=12,BC=10,
.点E、F分别是棱PB、CD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b3fb0035-8999-4251-a2b3-762378d17f1e.png?resizew=162)
(1)求证:AB⊥面PAD.
(2)求证:EF∥面PAD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d34ac97b116fc5c4e99d07dda1c50b3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/b3fb0035-8999-4251-a2b3-762378d17f1e.png?resizew=162)
(1)求证:AB⊥面PAD.
(2)求证:EF∥面PAD.
您最近一年使用:0次
17-18高一·全国·课后作业
4 . 如图,在长方体ABCD-A1B1C1D1中,E是BC上一点,M,N分别是AE,CD1的中点,AD=AA1=a,AB=2a,求证:MN∥平面ADD1A1.
![](https://img.xkw.com/dksih/QBM/2018/11/8/2070969054011392/2076017732132865/STEM/30c860ad5c1946368667df8e0bde1ddb.png?resizew=106)
您最近一年使用:0次
名校
5 . 如图,矩形
中,
,
是
边上异于端点的动点,
于点
,将矩形
沿
折叠至
处,使面
面
.点
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457819988353024/2458335274868736/STEM/37504908d8dd480abb4ddb6e3e2f8594.png?resizew=303)
(1)证明:
//面
;
(2)设
,当x为何值时,四面体
的体积最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9639896487e6cf18e8fd02d2a7ed2087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab384f2520d76ed8fa01b31e09c1eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a47ca365469c996a6b8cb47284764f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46efd4004cc47ba16d3d53b07d40b145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd15759154791f261a36b44f42dadec.png)
![](https://img.xkw.com/dksih/QBM/2020/5/7/2457819988353024/2458335274868736/STEM/37504908d8dd480abb4ddb6e3e2f8594.png?resizew=303)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7775df7ba0dc94c15e9e706194a463f1.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e787bb792dcd936cb4e87023c95011b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f780ed359b94450fc80cf57e66a4ad8.png)
您最近一年使用:0次
名校
解题方法
6 . 如图,在多面体
中,四边形
是正方形,
是等边三角形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/b4c40b91-ca13-439b-b350-292a04e6a847.png?resizew=154)
(1)求证:
平面
;
(2)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0d883c2241db933cc16c3734ef0a8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2f042901f9931fcc9b418752261d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c18d06be166d9e0a9d8661db7b8f852.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/b4c40b91-ca13-439b-b350-292a04e6a847.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1496afecd92a619fbe5e9b736f06f4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93daae6ec80968c0630e229c1fa1b84.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次