如图,在四棱锥
中,
平面
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/22964367-c593-427e-be73-d2deaf315bc5.png?resizew=135)
(1)证明:
;
(2)求平面
与平面
夹角的正弦值;
(3)设
为棱
上的点,满足异面直线
与
所成的角为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c828839ec7daffe75d61c24298afe7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/22964367-c593-427e-be73-d2deaf315bc5.png?resizew=135)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/352d85caf2bd9c6c66709d09df0ee0ac.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2021-09-25 19:03:55
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在三棱锥
中,
为等边三角形,且
.
(1)求证:
;
(2)若面
面
,且
,求
与面
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/3/7be2e0ce-ca41-4e36-af7c-3057be1727dc.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
(2)若面
![](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/852a35935d668f92ed82f6baaff5ab60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,边长为4的正方形
中,点
,
分别为
,
的中点.将
,
,
分别沿
,
,
折起,使
,
,
三点重合于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/2506b5a9-e4f1-4223-9f68-6f831819cca4.png?resizew=340)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccbf98ff1b1f121ee3aa3dec108ba0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b285934db0cd25f729d8eb2ab4b8524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6fdadad5411ba41fae9277326f49cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/2506b5a9-e4f1-4223-9f68-6f831819cca4.png?resizew=340)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3d49759594355505caaf42691e5363.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图所示,在等腰梯形
中,
,
,
为
中点.将
沿
折起至
,使得平面
平面
,
分别为
的中点.
(Ⅰ) 求证:
面
;
(Ⅱ) 求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/null/STEM/4cf4bee26ceb4842bf44e25cd78e41b7.png?resizew=348)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/408be444c1bf48639dcdc5a81cd68940.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/e5266c522f584b5e9ccec5c338da51be.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/7e99d7969f804740a6f25b8646b5725a.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/5b7200e383954b0f94209053c36214a7.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/e61c19b2ca4440498e2e2994c17b4c91.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/5eca32991b034c40a2293a65fc33ee71.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/dc1861e7817d49218ad78aa970a9a939.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/229f79415f7d43b5b3903dd5cb7dc8d0.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/8bfb2e9c30374127bfe61832730ca072.png?resizew=52)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/28c1632a047c4a689b07f0b60caaa395.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/f8204085d91c4774b927cec0ea493ecb.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/430dddb51c144110a08b14effb9a8098.png?resizew=53)
(Ⅰ) 求证:
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/f6c1b2ea56574ce59b418dcab89a10d3.png?resizew=42)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/893a3496fe4d470fa92bb5b633654b05.png?resizew=37)
(Ⅱ) 求二面角
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/a84af7f93ab6465ba39cc413074c1677.png?resizew=81)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/null/STEM/4cf4bee26ceb4842bf44e25cd78e41b7.png?resizew=348)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/ANSWER/4b18e9ec776048099028b263124f9066.png?resizew=171)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图所示,在四棱锥P-ABCD中,底面ABCD是矩形,PD=DC=2BC=2,PD⊥平面ABCD,E是PC的中点,过E作EF⊥PB交PB于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/20513056-7adc-407e-b129-e2f31a94ad4a.png?resizew=185)
(1)求证:平面PBD⊥平面DEF;
(2)求二面角C-PB-D的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/20513056-7adc-407e-b129-e2f31a94ad4a.png?resizew=185)
(1)求证:平面PBD⊥平面DEF;
(2)求二面角C-PB-D的余弦值.
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
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/fca4ee3d-0bb2-4e39-aa29-677c4bf4791f.png?resizew=214)
(1)证明:
;
(2)若
是边长为3的等边三角形,点
在棱
上,
且三棱锥
的体积是
,试求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/fca4ee3d-0bb2-4e39-aa29-677c4bf4791f.png?resizew=214)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b01898d4ad9757e07bddd6c26e59d1f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfe3a8391fa6dd5535e9b5b4d8339a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8a91062cd1f6e139960b219e9eeb26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/324d453870b345da0c41977290192f94.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图一,等腰直角三角形
的底边
,点
在线段
上,
于
,现将
沿
折起到
的位置(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/beb844e0-bf87-4a36-9d2a-20387675b8fd.png?resizew=333)
(1)求证:
;
(2)若
,直线
与平面
所成的角为
,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/beb844e0-bf87-4a36-9d2a-20387675b8fd.png?resizew=333)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30987c1ff8b2cc69bb6ad6c41bde18b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ca27617694319e68fdec8fdb11c099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图所示的多面体
中,
底面
,四边形
为正方形,
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572927076605952/1572927082889216/STEM/098a67b7cb984a1d8a47c0b16e645bff.png?resizew=121)
(1)求证:
平面
;
(2)当三棱锥
的体积为4时,求多面体
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8b58a5f8b25e6162e61e4470f443da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50b67b8269ad8f7608e334ed3e8e114e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572927076605952/1572927082889216/STEM/098a67b7cb984a1d8a47c0b16e645bff.png?resizew=121)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d435a91c0447826d31158be0ce5a9e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐3】如图,已知直角梯形
与等腰梯形
所在的平面互相垂直,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/4dc54344-37dc-46bd-a3cf-994321cf6a9e.png?resizew=179)
(1)证明:
;
(2)求二面角
的余弦值;
(3)判断直线
与平面
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68dfd32a77c3615069ad1e7eb5b226a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c62cca87325b32db22204f7cfa6cbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6240d83351b156ab5a8c0e2a9f0e277c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0da7cbc970d76b70d21407da8d1df3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/4dc54344-37dc-46bd-a3cf-994321cf6a9e.png?resizew=179)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff24d05b5b9502c2be337f9be84fe4ed.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41861a8201bf8378a05a09ae0bd84635.png)
(3)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,正方体
的棱长为1,
分别为
的中点.
;
(2)求
与
所成角的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea873460de547a101cbb1e0925c5502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c943379a9eaf10e15601b0d95d57d65e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.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
中,
,点
在棱
上移动.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618960246816768/2623399526727680/STEM/f7b1c9a1-d861-4b4f-8cfb-609397aaf055.png)
(1)求异面直线
与
所成角的余弦值;
(2)当
为
的中点时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c055f501be7955b830414006bf8546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618960246816768/2623399526727680/STEM/f7b1c9a1-d861-4b4f-8cfb-609397aaf055.png)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
(2)当
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
您最近一年使用:0次