1 . 如图,四棱锥
中,
平面
,
,
,
,
,
,
是
中点,
是线段
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/c9cc232e-277b-47e4-91aa-86401d78febe.png?resizew=159)
(1)若
是
中点,求证:
平面
;
(2)设
与平面
所成角为
,求
最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb2e071d4e01107dcf7d95cbb86b415.png)
![](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/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a260579533cbf20b8fcff1cd6e736e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3ba8b214034c287276f4966069d95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/c9cc232e-277b-47e4-91aa-86401d78febe.png?resizew=159)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5da631296d53a08d56fb5f9bec2376c.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
您最近一年使用:0次
2 . 如图,四棱柱
的底面为菱形,
底面
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/b96b838d-6268-4279-b375-772a0d561b8e.png?resizew=172)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:平面
平面
;
(Ⅲ)若
,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/b96b838d-6268-4279-b375-772a0d561b8e.png?resizew=172)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e2f4fa50b5d6e843c2f54f3b44b836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503be2b7feae04f09c329dd3cd8ee58c.png)
(Ⅱ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7c60a0de546f75b46348265746aa707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea124cef7ab3fd8069243e9894d1c59.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962ddfa6a45e5588279c2a93f142924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1158eaa2e338f564eb18de5bef1d25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
3 . 如图,PA⊥平面ABCD,四边形ABCD是矩形,
,
,点F为PB中点,点E在边BC上移动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/441d3dc9-1ef9-4b96-b10b-39245dc14bdb.png?resizew=143)
(Ⅰ)求证:PD∥平面AFC;
(Ⅱ)若
,求证:
;
(Ⅲ)若二面角
的大小为60°,则CE为何值时,三棱锥
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/441d3dc9-1ef9-4b96-b10b-39245dc14bdb.png?resizew=143)
(Ⅰ)求证:PD∥平面AFC;
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
(Ⅲ)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437c9774700f6c066b3e19d17d54b368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
您最近一年使用:0次
名校
4 . 以下命题(其中
表示直线,
表示平面)
①若
,则
②若
,
,则
③若
,
,则
④若
,
,则
其中正确命题的个数是______________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ea64ea196fc9d88be23c053e278219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b330d69a949d9b55f4b6f18f47e0a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b330d69a949d9b55f4b6f18f47e0a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e076b91a9178217532e11c496400e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72fbc714c63815dad9a27418f6492f16.png)
其中正确命题的个数是
您最近一年使用:0次
2019-05-08更新
|
962次组卷
|
2卷引用:江苏省江阴市第一中学2018-2019学年高一下学期期中考试数学试题
名校
5 . 已知三棱锥
中,
,
.若平面
分别与棱
、
、
、
相交于点
、
、
、
,且
平面
,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/1737476c-0457-471a-b30d-52a3da0ff341.png?resizew=198)
求证:(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413c799e8fb983e6274ec4be9ff6c431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb178784aa857d4d4683e650273f054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/1737476c-0457-471a-b30d-52a3da0ff341.png?resizew=198)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae963762d6330c9d880ca16be9d0cdaa.png)
您最近一年使用:0次
2019-04-27更新
|
410次组卷
|
2卷引用:【校级联考】江苏省沭阳县2018-2019学年高一下学期期中考试数学试题
6 . 如图,在四棱锥P-ABCD中,底面ABCD是边长为2的菱形,∠DAB=60°,PD=4,M为PD的中点,E为AM的中点,点F在线段PB上,且PF=3FB.
(Ⅰ)求证EF∥平面ABCD;
(Ⅱ)若平面PDC⊥底面ABCD,且PD⊥DC,求平面PAD与平面PBC所成锐二面角的余弦值.
(Ⅰ)求证EF∥平面ABCD;
(Ⅱ)若平面PDC⊥底面ABCD,且PD⊥DC,求平面PAD与平面PBC所成锐二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/3bb35e79-912b-489d-890b-6c697da18b79.png?resizew=149)
您最近一年使用:0次
7 . 如图,在多面体ABCED中,BE⊥CD,平面ABED⊥平面BCE.在梯形ABED中,AB∥DE,BE⊥AB.DE=BE=CE=2AB,M是BC的中点,点N在线段DE上,且满足DN=
DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/6100a116-ae4a-4b2d-8f1e-af8c4cb26e08.png?resizew=145)
(1)求证:MN∥平面ACD;
(2)若AB=2,求点N到平面ABC的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/6100a116-ae4a-4b2d-8f1e-af8c4cb26e08.png?resizew=145)
(1)求证:MN∥平面ACD;
(2)若AB=2,求点N到平面ABC的距离.
您最近一年使用:0次
8 . 如图,在四棱锥
中,
,
,
,
,
,垂足为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/cfca8f51-8dd5-4e71-b5c8-e0c5b6970847.png?resizew=138)
求证
平面PCD;
求点E到平面PCD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58bafdd3bb54ba3491b49ab60b172f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5409b96d96738a7d021942b9f35b906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263bb1bfa22324c5eb08ba325ef7013b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac16608510c5a017da903d84a559efa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11330fb96575fd18b2a8085759a76d81.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/cfca8f51-8dd5-4e71-b5c8-e0c5b6970847.png?resizew=138)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5258a6f9c63914b9e2ec95b6d39313b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
您最近一年使用:0次
9 . 如图,四棱锥
中,
底面
,
,
,
,
,点
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180043786903552/2182293949030400/STEM/8d4e6755b82d4a7a9401a73118479071.png?resizew=194)
(1)证明:
平面
;
(2)求
点到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](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/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8745717601cd14b46c2298919b41b502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180043786903552/2182293949030400/STEM/8d4e6755b82d4a7a9401a73118479071.png?resizew=194)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f369bec2d5682bf6b8b317a08aff546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次
2019-04-14更新
|
1106次组卷
|
2卷引用:【省级联考】甘肃省2019届高三第一次高考诊断考试数学(文)试题
18-19高二下·上海·期中
名校
10 . 已知直线
及平面
,下列命题中:
①
;②
;③
;④
.
所有正确命题的序号为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae455e98b1504510d335d2d3fa750eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93e74286fb669d945e4a506a51a2cfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1002f45f6a74b22ae99437f9e76baed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ed3911a6114565b9ce3093df042f6f.png)
所有正确命题的序号为
您最近一年使用:0次