如图,在矩形
中,
,
为
的中点,将
沿
折起到
的位置,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/2262ec71-62dc-49fa-8fcc-6459f7d2b21e.png?resizew=234)
(1)证明:
平面
;
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe40405cd7bd60d69dd535d6da85c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/20/2262ec71-62dc-49fa-8fcc-6459f7d2b21e.png?resizew=234)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99998f33ad6edab18180627d4903dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeadd146662b5d8fe14a424138ef751.png)
更新时间:2020-10-28 13:01:35
|
相似题推荐
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在棱长为4的正方体
中,
,
分别是棱
,
上的动点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/99bf5407-188b-41ac-a20b-40b9e83b99a4.png?resizew=220)
(1)求证:
;
(2)当三棱锥
的体积取得最大值时,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/99bf5407-188b-41ac-a20b-40b9e83b99a4.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7c16fcd117047c6c81ab37118e4c5.png)
(2)当三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d572b24c3b4549b7fd579d5706c5970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bff3ccea5989c60e51e321af3f53f54.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2】如图所示,在直三棱柱
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3371affe8a6bb77078b4edab77b1227f.png)
![](https://img.xkw.com/dksih/QBM/2022/6/4/2994043638784000/2995047023394816/STEM/99133153dbf7456f96b42d1db281fd44.png?resizew=152)
(1)当P为
的中点时,求证:
平面
;
(2)当
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3371affe8a6bb77078b4edab77b1227f.png)
![](https://img.xkw.com/dksih/QBM/2022/6/4/2994043638784000/2995047023394816/STEM/99133153dbf7456f96b42d1db281fd44.png?resizew=152)
(1)当P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4145f6d9dd03cd2317f9d999991e8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06ed3e88f623ed9313d06b1bb2a87ee.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34b7435f674beb041681fd5615a5b88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dda24f918ca93438191b8847cc920411.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】如图甲,直角梯形ABCD中,AB⊥AD,AD
BC,F为AD中点,E在BC上,且
,已知AB=AD=CE=2,现沿EF把四边形CDFE折起如图乙使平面CDFE⊥平面ABEF.
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758325185167360/2758421906546688/STEM/013735cb8c0f4544a918fd1711e1bfed.png?resizew=309)
(1)求证:
平面BCE;
(2)求证:平面ABC⊥平面BCE;
(3)求三棱锥C﹣ADE的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f36d315245b63a811d5c6f348c17b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758325185167360/2758421906546688/STEM/013735cb8c0f4544a918fd1711e1bfed.png?resizew=309)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810ee7bc82b6f452afb3fc18691abc3b.png)
(2)求证:平面ABC⊥平面BCE;
(3)求三棱锥C﹣ADE的体积.
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2】如图,矩形
所在平面与直角梯形
所在的平面垂直,
,
.
(1)求证:
平面
;
(2)若
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed890fd82ca12237dde69853861191c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93afd283daab136b99f4a25b195fa01.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c130c317-cb39-4efe-bf37-230d51f2d61e.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b2d2f8eb476a313b02f90b71bf8b0b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c54b729996e63624d896ac0409083c28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5eb013e9ada417d1c19b9771e6f4127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
您最近一年使用:0次