名校
1 . 如图,在直三棱柱
中,
,
,
为
的中点.
平面
.
(2)若以
为直径的球的表面积为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95578eba5dd34ca64b5f228640819cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b531aaca9d037a0d047511eec8f350ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504a36c231b8e80724d01649e7c0944f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95265f94a8eb7f76b5db6875246a091d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee527f97d0bfc89f791b728d80e562d3.png)
您最近一年使用:0次
2024-04-20更新
|
1382次组卷
|
3卷引用:江西省赣州市十八县(市)二十四校2023-2024学年高二下学期期中考试数学试题
2 . 如图,在三棱柱
中,
,
,
平面
.
平面
;
(2)若点
在棱
上,当
的面积最小时,求三棱锥
外接球的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90e17995e2f71e297d94ae51c7e5b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43732729894297552d9210f41a634769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e16f65c3a318220c2f5baac171bbb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eedadb500cb9faa9de59d0cfdf338c0.png)
您最近一年使用:0次
3 . 如图,在正六棱锥
中,
为底面中心,
,
.
(1)若
,
分别是棱
,
的中点,证明:
平面
;
(2)若该正六棱锥的顶点都在球
的表面上,求球
的表面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7858d6cc36eeb5a39dc631f7e5ac1394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f1750bc092092927d2d73b0b79fde0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9466d03bc916a9169eaf39863d59fceb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/9f657da7-ebe7-4db4-beaa-09608eb29508.png?resizew=186)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4db9b82b67efe45a02fca32bfcf5dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
(2)若该正六棱锥的顶点都在球
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
2023-07-11更新
|
459次组卷
|
2卷引用:江西省宜春市丰城市第九中学2023-2024学年高二上学期开学考试数学试题
4 . 古希腊的哲学家柏拉图证明只存在5种正多面体,即正四、六、八、十二、二十面体,其中正八面体是由8个正三角形构成.如图,若正八面体的体积为
,则它的内切球半径为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd905fb4dd19b5cae348ecb12845f9ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/8e01fdec-6008-491a-9b9f-efb1404a6fff.png?resizew=116)
您最近一年使用:0次
名校
5 . 如图,点C在直径为AB的半圆O上,CD垂直于半圆O所在平面,平面ADE⊥平面ACD,且CD∥BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/eef206de-b81d-46fe-a5f9-088adbb04306.png?resizew=204)
(1)证明:CD=BE;
(2)若AC=1,AB=
,∠ADC=45°,求四棱锥A -BCDE的内切球的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/eef206de-b81d-46fe-a5f9-088adbb04306.png?resizew=204)
(1)证明:CD=BE;
(2)若AC=1,AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
您最近一年使用:0次
2021-08-17更新
|
1337次组卷
|
3卷引用:江西省新干中学2023届高三一模数学(理)试题
6 . 在底面是矩形的四棱锥
中,
面ABCD,
,
.
(1)求证:面
面PDC;
(2)求四棱锥
外接球的体积.
![](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/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
(1)求证:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
您最近一年使用:0次
解题方法
7 . 如图,点C在直径为
的半圆O上,
垂直于半圆O所在的平面,平面
平面
,且
.
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449793552179200/2450475501068288/STEM/0f43ac3978f24e5db7a8d2c52843b6bc.png?resizew=163)
(1)证明:
.
(2)若
,
,异面直线
与
所成的角是
,求四棱锥
的内切球的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef0f4f2fa1f55c4d82d11ac48566489.png)
![](https://img.xkw.com/dksih/QBM/2020/4/26/2449793552179200/2450475501068288/STEM/0f43ac3978f24e5db7a8d2c52843b6bc.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
您最近一年使用:0次
真题
名校
8 . 如图,在斜三棱柱
中,
,
,
,侧面
与底面
所成的二面角为120°,
分别是棱
、
的中点.
(1)求
与底面
所成的角;
(3)求经过
四点的球的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede6a60cad0e0b58e1549fda6e085719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68bd092beb0a55c16bc349df9f4862da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9748be98b0f308f3f34f7f3dbade9e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071cae0201e80bdc2a8f722694093ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b96dce1ec94eb90c243b2eddb78476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846a84e40de724b4c60a20c4faa194b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5048a0736cfe012cfc909e631e2a2969.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5048a0736cfe012cfc909e631e2a2969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
(2)证明平面
;
(3)求经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833490660e26804ee5639924729f4efe.png)
![](https://img.xkw.com/dksih/QBM/2018/12/9/2092925445865472/2094360909873152/STEM/637b5e4b8b4f4b32b125e215648888fa.png?resizew=197)
您最近一年使用:0次
2018-12-11更新
|
520次组卷
|
3卷引用:江西省玉山一中2019届高三第一学期期中考试数学(理科)试题
名校
解题方法
9 . 如图,
分别是正方体
的棱
,
的中点,棱长为
,
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
//平面
.
(2)求正方体
外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f8accdb21a85e7251360bdb6b6953a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89851b6a4fe58a8a042d6a97c4eb317.png)
(2)求正方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
2018-10-19更新
|
1126次组卷
|
2卷引用:江西省吉安市白鹭洲中学2022-2023学年高二上学期期末考试数学试题
2011·江西赣州·一模
10 . 已知直角梯形
中,
,
,
,
,
,过
作
,垂足为
,
分别为
的中点,现将
沿
折叠,使得
,
![](https://img.xkw.com/dksih/QBM/2011/5/30/1570227377414144/1570227382804480/STEM/9f4ad2e5-f6ac-416b-878a-944db50e6d8a.png?resizew=325)
(1)求证:
面
;
(2)设四棱锥
的体积为
,其外接球体积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7257da2f184aedcd7015c7873f48cf97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a91bcaf6fb4bda284c3fca6c103e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4320b5bb88f112357bf2700e1924ee.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/6c91bc1e2d0efdcbc982507b104b7dee.png)
![](https://img.xkw.com/dksih/QBM/2011/5/30/1570227377414144/1570227382804480/STEM/9f4ad2e5-f6ac-416b-878a-944db50e6d8a.png?resizew=325)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a779876cdfb2c489ad0eaed0f73e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)设四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675127116b1cace5e3158a88b7a2044a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618ee2b75cea58378952b419322d635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2876f586a63135ce147be27f9b9d4308.png)
您最近一年使用:0次