名校
解题方法
1 . 将三棱锥
与
拼接得到如图所示的多面体,其中
,
,
,
分别为
,
,
,
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/bbaa2f22-1aad-47c3-99db-f1ae79f7b059.png?resizew=186)
(1)当点
在直线
上时,证明:
平面
;
(2)若
与
均为面积为
的等边三角形,求该多面体体积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9072b69d2f0d27f940a49f1db4b27fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c51d16ed607407429e6640ad90d75b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08348699f7bb1069ee4ae52b7f7c4ae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/bbaa2f22-1aad-47c3-99db-f1ae79f7b059.png?resizew=186)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19247393d6b9122742a1a926ff495314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e13d79711f6e435beccf2ccb2247ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33c2aa4cb5a3b8da3b188ab6a21520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
您最近一年使用:0次
2020-02-18更新
|
452次组卷
|
2卷引用:2019届山西省晋城市百校联盟高三上学期第一次模拟考试数学(文)试题
解题方法
2 . 如图,在正三棱柱
中,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/6/5/2736409118883840/2801090348744704/STEM/1b5ff506-778b-42b0-b5c9-cb4416de5fb2.png?resizew=177)
(1)若
是面积为6的直角三角形,则此三棱柱的体积为多少?
(2)在线段
上确定一点
,使得
平面
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://img.xkw.com/dksih/QBM/2021/6/5/2736409118883840/2801090348744704/STEM/1b5ff506-778b-42b0-b5c9-cb4416de5fb2.png?resizew=177)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c3a59c194a2365abcd14cc3f0e6d25.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0457394ce4f2dc8d940c565c94dcf557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2021-09-04更新
|
267次组卷
|
3卷引用:山西省吕梁市柳林县2020-2021学年高一下学期5月月考数学试题
山西省吕梁市柳林县2020-2021学年高一下学期5月月考数学试题(已下线)8.5 空间直线、平面的平行(精讲)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)第六章 立体几何初步(B卷·提升能力) -2021-2022学年高一数学北师大版2019必修第二册
名校
解题方法
3 . 如图,在多面体
中,四边形
是正方形,
是正三角形,
,
,
.
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573025185284096/1573025191321600/STEM/fff0b3427c6940a0b2ac776e11d9dc4f.png)
(1)求证:
平面
;
(2)求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a91478bb050c5f65793155c29ec27de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2f042901f9931fcc9b418752261d87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2a2acf383667b8ff3575fdeccc8e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7579755d7d17bd72d97b03df323aefa4.png)
![](https://img.xkw.com/dksih/QBM/2016/9/14/1573025185284096/1573025191321600/STEM/fff0b3427c6940a0b2ac776e11d9dc4f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c920d02068d0e63ffdab70786c526d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93daae6ec80968c0630e229c1fa1b84.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
您最近一年使用:0次
2016-12-04更新
|
1381次组卷
|
4卷引用:2016届山西太原市高三二模考试数学(文)试卷
名校
4 . 如图,菱
与四边形
相交于
,
平面
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/e305e394-a7a8-442c-a496-e1f00cc0805b.png?resizew=242)
(1)求证:
平面
;
(2)求直线
与平面
成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e53164bb576ae54daff37bec4b2eacd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c919e775030a0d72da748ff579d023b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/327832ffb5a937d88a1069395a8552af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/e305e394-a7a8-442c-a496-e1f00cc0805b.png?resizew=242)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb889644ad10bffc2319e1f02640003b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
您最近一年使用:0次
2017-06-02更新
|
767次组卷
|
5卷引用:山西省部分学校2023届高三下学期质量检测试题
名校
5 . 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:【全国百强校】山西省运城市康杰中学2018届高考模拟(二)数学(理)试题
名校
6 . 如图所示,已知多面体
中,四边形
为菱形,
为正四面体,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/8aed5a62-e5b8-475e-9aed-725f94c3ee4c.png?resizew=192)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fc1129846f37afdafd751627c450d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7045cee264e93b07cdf00012bd881a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/8aed5a62-e5b8-475e-9aed-725f94c3ee4c.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22eea13efafb003e7b08a6f0bc0f2f3.png)
您最近一年使用:0次
2020-05-03更新
|
307次组卷
|
4卷引用:山西省临汾市2019-2020学年高三下学期高考考前适应性训练(二)数学(文)试题
名校
7 . 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:山西省太原十二中2018届高三上学期1月月考数学(理)试卷
解题方法
8 . 如图,四棱锥
中,
平面
且
.底面
是平行四边形,且
,
,
,
交
于
.
![](https://img.xkw.com/dksih/QBM/2021/5/14/2721015920304128/2730945619263488/STEM/dc1c20f8-5e50-4847-af06-58808cec3b94.png?resizew=201)
(1)
上是否存在一点
,使得
平面
?若存在,试确定
点的位置,若不存在,说明理由﹔
(2)对于(1)中的
,求二面角
的余弦值.
![](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/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f9a3c6437165a2a5a2e95bf620160d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2021/5/14/2721015920304128/2730945619263488/STEM/dc1c20f8-5e50-4847-af06-58808cec3b94.png?resizew=201)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)对于(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e07253801c26a8a532ddbd99ecde8de.png)
您最近一年使用:0次
名校
解题方法
9 . 在四棱锥
中,
底面
平分
为
的中点,
分别为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/0171c99a-8994-413d-a7bb-6d6dd77f5ad1.png?resizew=256)
(1)求
的值,使得
平面
;
(2)过点
作平面
的垂线,垂足为
,求四棱锥
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/c1d899bc757d27b6f91aa0552300cf3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c0229a9dcb5c3fa67be5ecf0955cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc39e7848750dc6766c335eae34a89a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ef5a0b7270ffd1819f044b849925e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7e7e42ef653d2d6284c032df57c06b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/0171c99a-8994-413d-a7bb-6d6dd77f5ad1.png?resizew=256)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e50be91c830e77f021b650d0ce9d9c84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73153657848013d2a1c3247d7f84ddeb.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64e10e589f37ac022dc9251bf5969040.png)
您最近一年使用:0次
2017-03-12更新
|
460次组卷
|
3卷引用:2017届山西省长治二中、晋城一中、康杰中学、临汾一中、忻州一中五校高三第四次联考数学(文)试卷
解题方法
10 . 如图,平面
平面
,四边形
为直角梯形,
,四边形
为等腰梯形,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/c7976795-c781-4ab1-ac68-eac0192126cc.png?resizew=173)
(1)若梯形
内有一点
,使得
平面
,求点
的轨迹;
(2)求平面
与平面
所成的锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c674dc5024374f53920947c4cf4baf11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d861af475ba1715789c1b811f81b3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607cf996a966b2682d50dec151ac1a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d861af475ba1715789c1b811f81b3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2550fca125b1f9e31f65701e4d0637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ad35692f2707b24509ffa790f79896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/c7976795-c781-4ab1-ac68-eac0192126cc.png?resizew=173)
(1)若梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d861af475ba1715789c1b811f81b3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60d66204e1abc17bd01749f187f8050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9186e4574ffe28e673724fcb019db208.png)
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