棱长为2的正方体
中,E为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/197dc319-625b-46bf-a7e9-8fd7356c8dda.png?resizew=198)
(1)求证:
平面
;
(2)求平面
与平面ABCD所成角的余弦值;
(3)求B到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/197dc319-625b-46bf-a7e9-8fd7356c8dda.png?resizew=198)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5830646a912c3a916beac4f88c116b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(3)求B到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
更新时间:2021-11-11 10:11:20
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知等腰梯形ABCD(如图1所示),其中AB∥CD,E,F分别为AB和CD的中点,且AB=EF=2,CD=6,M为BC中点.现将梯形ABCD沿着EF所在直线折起,使平面EFCB⊥平面EFDA(如图2所示),N是线段CD上一动点,且
.
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876366785724416/1877037849575424/STEM/3ce2693965944d958d9e517056650874.png?resizew=298)
(1)求证:MN∥平面EFDA;
(2)求三棱锥A-MNF的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc1054a3a9295f5a30c9cea6aa3630c.png)
![](https://img.xkw.com/dksih/QBM/2018/2/6/1876366785724416/1877037849575424/STEM/3ce2693965944d958d9e517056650874.png?resizew=298)
(1)求证:MN∥平面EFDA;
(2)求三棱锥A-MNF的体积.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知四棱锥
,底面
为平行四边形,
,
,
,
,
.
(Ⅰ)若平面
平面
,证明:
;
(Ⅱ)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bc7774144c164f7ebaeca54fa657e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929268210da5976bc37d080da030dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4307209e1e5cad88fc1b8163858688ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c64f5f11748e0277788dd252ac62d57d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/f12bed4b-768a-4262-8254-288e48ba6be2.png?resizew=117)
(Ⅰ)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5790c78556aa9ad78be908c55bf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b611d45181bd1539bcd8c548502304b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbf6462666c8015e7de28e344af30b2.png)
(Ⅱ)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03a08e6ea74ee085ed9dd4a05af94c2.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】在四棱锥
中,底面
是正方形,若
.
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c6caa0455442437177ab9b995df37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6ff36ca0c0b166dc98b9c4ce7a59e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11df029afb11e4233989b1338cb3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5db7c9997f1d885cfece6ee4f44ff00.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,在四棱锥P-ABCD中,底面ABCD是直角梯形,
,AP⊥平面ABCD,
,点M、N分别为线段BC和PD的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975759587983360/2976508187648000/STEM/2904ea46d2394756904de6819d58edbd.png?resizew=164)
(1)求证:AN⊥平面PDM;
(2)求平面PDM与平面PDC夹角的正弦值;
(3)在线段PC(不包括端点)上是否存在一点E,使得直线BE与平面PDC所成角的正弦值为
,若存在,求出线段PE的长:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d89324f88c0c43c430a90498e61c2446.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975759587983360/2976508187648000/STEM/2904ea46d2394756904de6819d58edbd.png?resizew=164)
(1)求证:AN⊥平面PDM;
(2)求平面PDM与平面PDC夹角的正弦值;
(3)在线段PC(不包括端点)上是否存在一点E,使得直线BE与平面PDC所成角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
您最近一年使用:0次
【推荐1】如图,四边形
为平行四边形,点
在
上,
,且
.以
为折痕把
折起,便点
到达点
的位置,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/d39a3cbc-235d-4ce9-8864-f50b565ec016.png?resizew=277)
(1)求证:平面
平面
;
(2)若直线
与平面
所成角的正切值为
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10cc6253667c3dc31209bce3e682c0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f69bdcc04016435654599ec3481585b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/d39a3cbc-235d-4ce9-8864-f50b565ec016.png?resizew=277)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83303d3784492506fc44f2b4d6b07bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,在长方体ABCD-
中,点E为AD的中点,点P为
中点,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/4b36cf64-7975-46a9-bb39-6771069da7d2.png?resizew=123)
(1)求点P到平面
的距离;
(2)求直线BP与平面PEC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/4b36cf64-7975-46a9-bb39-6771069da7d2.png?resizew=123)
(1)求点P到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4755dc59cb5a03cd39879bc80fdbb9.png)
(2)求直线BP与平面PEC所成角的正弦值.
您最近一年使用:0次