1 . 如图,在棱长为
的正方体
中,
,
,
分别为棱
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645399155204096/2649594868277248/STEM/9ea155cc-472a-432c-ab14-13178ec4767c.png)
(1)求证:
;
(2)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645399155204096/2649594868277248/STEM/9ea155cc-472a-432c-ab14-13178ec4767c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017043e09cddb99a768e95f33e68e9c5.png)
(2)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc8ae97a46e2fed92b81d7c0be9a8b9.png)
您最近一年使用:0次
2 . 如图,在多面体ABCDEF中,底面ABCD为菱形,且∠DAB=
,AB=2,EF
AC,EA=ED=
,BE=
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/6af87239-af3b-4ada-856f-8834e144240e.png?resizew=192)
(1)求证:平面EAD⊥平面ABCD;
(2)求三棱锥F-BCD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/6af87239-af3b-4ada-856f-8834e144240e.png?resizew=192)
(1)求证:平面EAD⊥平面ABCD;
(2)求三棱锥F-BCD的体积.
您最近一年使用:0次
2021-02-02更新
|
302次组卷
|
2卷引用:山西省汾阳市2020-2021学年高二上学期期末数学(文)试题
解题方法
3 . 如图,在四棱锥
中,底面
为直角梯形,
,
,
平面
,
,设点M为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/93a9146d-8dea-49b8-99d7-c8d2124b3ecc.jpg?resizew=189)
(1)若四棱锥
的体积为2,求异面直线
,
所成角的余弦值;
(2)若二面角
的余弦值为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/93a9146d-8dea-49b8-99d7-c8d2124b3ecc.jpg?resizew=189)
(1)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c123937cd5c0769090771598d6aee7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08e91d2fa9519a5f48d488176700499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2021-01-28更新
|
94次组卷
|
2卷引用:山西省太原市2020-2021学年高二上学期期末数学(理)试题
解题方法
4 . 如图,在四棱锥
中,底面
为直角梯形,
,
,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642465470758912/2645988240670720/STEM/8e20c89c-fb3b-482a-bc8c-7b2f5429671b.png?resizew=247)
(1)设点
为
的中点,求异面直线
、
所成角的余弦值;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d11dd7422f4703763abc23d83c7584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642465470758912/2645988240670720/STEM/8e20c89c-fb3b-482a-bc8c-7b2f5429671b.png?resizew=247)
(1)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2bc5e50b8dfa02601c70822252854a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4157481699496e311bb990a1f3310476.png)
您最近一年使用:0次
2021-01-28更新
|
110次组卷
|
2卷引用:山西省太原市2020-2021学年高二上学期期末数学(理)试题
名校
解题方法
5 . 如图,在三棱锥
中,
,
,
,点D,E分别为AB,PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b9c316ae-b5d1-4dbf-a6d0-c9a3d7d785b4.png?resizew=200)
(1)证明:
平面ABC;
(2)设点F在线段BC上,且
,若三棱锥
的体积为
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f698605a196cf83ccba6a601d0e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922118e5e548bd7ff2ed1e8e46f6b041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b9c316ae-b5d1-4dbf-a6d0-c9a3d7d785b4.png?resizew=200)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
(2)设点F在线段BC上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a23b226252730b5902ec96685b0a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b115316e0fcd2ef46a4dd383472996e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fd7b7834f33ed54661f2ce4328f661a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2021-01-28更新
|
427次组卷
|
4卷引用:山西省太原市2021届高三上学期期末数学(文)试题
6 . 已知四棱锥
的底面
为直角梯形,平面
底面
,
,
,
,
,
,
的中点分别是
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643792820715520/2645201646452736/STEM/853c823157f2487a93c7e1a1c712aa84.png?resizew=196)
(1)求证:
平面
;
(2)二面角
的正弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c9d5c0b9d7b7cf3e14f56bc3b4ac2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70e550fa3c5aaf1b9c28f36fd5ed5d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643792820715520/2645201646452736/STEM/853c823157f2487a93c7e1a1c712aa84.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95beabc50316cb3394397998d3a2b2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(2)二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0dcdff74d82c751b8a997903cd02afd.png)
您最近一年使用:0次
7 . 如图,在三棱锥
中,
,
,
,点
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643807525953536/2645174204219392/STEM/a7769bbe-f879-477e-ba27-7c821f3a289e.png?resizew=258)
(1)证明:平面
平面
;
(2)设点
在线段
上,且
,若二面角
的大小为45°,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f698605a196cf83ccba6a601d0e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922118e5e548bd7ff2ed1e8e46f6b041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643807525953536/2645174204219392/STEM/a7769bbe-f879-477e-ba27-7c821f3a289e.png?resizew=258)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)设点
![](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/1934b955ca0e33bb9cb260c86e889e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617e875b6421c59f0542741bf2256a28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解题方法
8 . 如图,四棱锥P-ABCD中,底面ABCD为平行四边形,
,
,
底面ABCD.
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642346579034112/2644386019434496/STEM/c893fbd0-b506-4b15-9bb8-963ced0dc35a.png)
(1)证明:
;
(2)设
,过BD的平面交PC于点M,若
,求三棱锥P-AMD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e0b64d25ddd18454f88e40c45d7d8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642346579034112/2644386019434496/STEM/c893fbd0-b506-4b15-9bb8-963ced0dc35a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b624742fe28db114e0554c6c87bff05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c21a72b548b71edd220999255ca5043.png)
您最近一年使用:0次
2021-01-26更新
|
66次组卷
|
3卷引用:山西省吕梁市2020-2021学年高二上学期期末数学(文)试题
9 . 如图,在等腰梯形ABCD中,
,
,
,
,AE为梯形ABCD的高,将
沿AE折到
的位置,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/b3983a9d-bde7-48f0-b02c-269e93fe3567.jpg?resizew=195)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/d932ff0c-12f0-4e20-abd8-65f53dbce9b4.jpg?resizew=188)
(1)求证:
平面ABCE;
(2)求平面PBC与平面PAE所成二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe40405cd7bd60d69dd535d6da85c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/b3983a9d-bde7-48f0-b02c-269e93fe3567.jpg?resizew=195)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/d932ff0c-12f0-4e20-abd8-65f53dbce9b4.jpg?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
(2)求平面PBC与平面PAE所成二面角的余弦值.
您最近一年使用:0次
2021-01-24更新
|
61次组卷
|
2卷引用:山西省吕梁市2020-2021学年高二上学期期末数学(理)试题
10 . 如图,在正方体
中,M为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642332216942592/2643197503987712/STEM/f40b0893-52ee-434b-86ec-432b2b2d0608.png?resizew=239)
(1)求证:
平面
;
(2)连接
,
,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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/2021/1/23/2642332216942592/2643197503987712/STEM/f40b0893-52ee-434b-86ec-432b2b2d0608.png?resizew=239)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8372f6eba66a0bd3587106daaf68d1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c597ff77c65c5add6f50294e3eee9536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2f7554a52815bfa0f4d75221ba7397.png)
您最近一年使用:0次
2021-01-24更新
|
84次组卷
|
2卷引用:山西省吕梁市2020-2021学年高二上学期期末数学(理)试题