名校
解题方法
1 . 如图,已知在等腰梯形
中,
,
,
,
,
=60°,沿
,
折成三棱柱
.
![](https://img.xkw.com/dksih/QBM/2019/3/29/2171048029880320/2175300594155520/STEM/f3789eb2185b4230bebf608d40eb82c5.png?resizew=279)
(1)若
,
分别为
,
的中点,求证:
∥平面
;
(2)若
,求二面角
的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4611ceb2a28f7a7e4d24266d7f99b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ff7bf8ffc8a04186e3e13c1a6d5ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1bcc181aa254e91bfc333c966e4637d.png)
![](https://img.xkw.com/dksih/QBM/2019/3/29/2171048029880320/2175300594155520/STEM/f3789eb2185b4230bebf608d40eb82c5.png?resizew=279)
(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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af633abfe3cb03f1836db6c570a5bcc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c9c2c831a0552a7c934365bc49ad3f.png)
您最近一年使用:0次
2018-06-07更新
|
727次组卷
|
4卷引用:[全国市级联考】河南省洛阳市2017-2018学年高二质量检测数学(理)
解题方法
2 . 如图,在四棱锥
中,
是等边三角形,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/faaccb5a-8ef6-4c76-a8bd-802e29995091.png?resizew=279)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89cf8dbc9bc63b426856976d64e83b8.png)
(2)若平面
平面
,
,
求三棱锥
的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4020b47658346639e42836fea8e672c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086b195fa3c01695809ba94ddf0261aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a357959bdb76f0f0eea876857aa8cdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/faaccb5a-8ef6-4c76-a8bd-802e29995091.png?resizew=279)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89cf8dbc9bc63b426856976d64e83b8.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8acbf7aa8e684b3bb898396d8de8a58e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0051d92c8639713847682826c2bb9783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157ddd1b7e7100c31df2fa040e75e908.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4875cf47422a791829637e4bd6460844.png)
您最近一年使用:0次
3 . 在三棱柱
中,已知
,
,点
在底面
上的射影恰好是线段
的中点
.
(1)证明:在侧棱
上存在一点
,使得
平面
,并求出
的长;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8f8e0feaafb269db76c14264de7108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)证明:在侧棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2d0727de4c16b53b4bb6ab370afde6c.png)
![](https://img.xkw.com/dksih/QBM/2018/7/18/1990900339367936/1991190396133376/STEM/6237c05768e846058eafc9f5771f99b3.png?resizew=196)
您最近一年使用:0次
4 . 已知A,B,C,D四点不共面,M,N分别是△ABD和△BCD的重心,求证:MN∥ 平面ACD.(写出每一个三段论的大前提、小前提、结论)
您最近一年使用:0次
5 . 如图,在四棱锥
中,
是等边三角形,
,
,
.
![](https://img.xkw.com/dksih/QBM/2018/5/21/1949937480687616/1950180190142464/STEM/0341d73b03b1445daa8543bb296e59fb.png?resizew=192)
(Ⅰ)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6c62979a7aa534a191d8387a741e8.png)
(Ⅱ)若平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
平面
,
,求二面角
的余弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e839ac941e8bf536ff35a12e56c7a400.png)
![](https://img.xkw.com/dksih/QBM/2018/5/21/1949937480687616/1950180190142464/STEM/0341d73b03b1445daa8543bb296e59fb.png?resizew=192)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf6c62979a7aa534a191d8387a741e8.png)
(Ⅱ)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
您最近一年使用:0次
6 . 如图,在三棱锥
中,
,其余棱长均为
是棱
上的一点,
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940927842893824/1947333515313152/STEM/cd78480e6e674ccf91d19b7d743264f7.png?resizew=208)
(1)求证: 平面
平面
;
(2)若
平面
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85aeab3aeaf4367b711da8cde2e8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59641403064c08e0011414ccdfb85377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://img.xkw.com/dksih/QBM/2018/5/8/1940927842893824/1947333515313152/STEM/cd78480e6e674ccf91d19b7d743264f7.png?resizew=208)
(1)求证: 平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9926397d0839f1a02946828dc348a7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
您最近一年使用:0次
2018-05-17更新
|
883次组卷
|
2卷引用:【全国校级联考】河南省豫西名校2017-2018学年高二下学期第二次联考数学(文)试卷
名校
解题方法
7 . 如图,在四棱锥
中,底面
为直角梯形,
∥
,
,平面
⊥底面
,
为
的中点,
,
,
.
(1)求证:平面
⊥平面
;
(2)在棱
上是否存在点
使得二面角
大小为
?若存在,求出
的长;若不存在,请说明理由.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8254b52b379a420c17d38334940b073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5729dd997ea7e8cb4cef8b7165b36e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c51c4a1148587943fe9ba210f6141ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a773fe6d12311dc321198697eb528ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/bddbaf77-697e-482f-a7f6-809fc327e4e9.png?resizew=169)
您最近一年使用:0次
2018-03-15更新
|
708次组卷
|
2卷引用:广东省中山一中、仲元中学等七校2017-2018学年高二3月联考数学(理)试题
8 . 如图,在三棱锥
中,
是正三角形,
,
分别为
,
的中点,
.
![](https://img.xkw.com/dksih/QBM/2018/7/4/1981271659053056/1982001044004864/STEM/78bd96517a604d3b90bc10597d637e14.png?resizew=217)
求证:(1)
平面
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53502463cc76201000e02df314e58769.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://img.xkw.com/dksih/QBM/2018/7/4/1981271659053056/1982001044004864/STEM/78bd96517a604d3b90bc10597d637e14.png?resizew=217)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f45265eaed2ba5fc08f6a112a02cd2.png)
您最近一年使用:0次
2018-07-05更新
|
955次组卷
|
3卷引用:【全国市级联考】江苏省苏州市2017-2018学年高二下学期学业质量阳光指标调研文数试题
9 . 如图,四面体
中,
、
分别
、
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2018/3/4/1894847958261760/1896477813276672/STEM/0d8ab2d04bea47ebbdbda0e95b2252d3.png?resizew=201)
(1)求证:
平面
;
(2)求异面直线
与
所成角的余弦值的大小;
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3777ffb7124b95a577f3d9a7b097c267.png)
![](https://img.xkw.com/dksih/QBM/2018/3/4/1894847958261760/1896477813276672/STEM/0d8ab2d04bea47ebbdbda0e95b2252d3.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2018-03-06更新
|
672次组卷
|
4卷引用:河北省保定市2017-2018学年高二上学期期末调研考试数学(理)试题
河北省保定市2017-2018学年高二上学期期末调研考试数学(理)试题吉林省通化市辉南县第六中学2023-2024学年高二上学期第一次半月考数学试题广东省惠州大亚湾经济技术开发区第一中学2023-2024学年高二上学期第一次月考数学试题(已下线)2018年高考数学备考中等生百日捷进提升系列(综合提升篇) 专题04 立体几何解答题(文)
10 .
棱台
的三视图与直观图如图所示.
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420818432/STEM/80d3cc790a2e4be79852fefe51921471.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420818432/STEM/41dcfb40d71246188536c119f2ba5102.png?resizew=207)
(1)求证:平面
平面
;
(2)在线段
上是否存在一点
,使
与平面
所成的角的正弦值为
?若存在,指出点
的位置;若不存在,说明理由.
棱台
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420818432/STEM/80d3cc790a2e4be79852fefe51921471.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/2018/6/15/1967883896307712/1968997420818432/STEM/41dcfb40d71246188536c119f2ba5102.png?resizew=207)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cdaadeae37736a1e6dd93fa1fe712f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
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5卷引用:河南省豫西名校2017-2018学年高二下学期第一次联考数学(理)试题
河南省豫西名校2017-2018学年高二下学期第一次联考数学(理)试题天一大联考2017—2018学年高中毕业班阶段性测试(四)理科数学2020年普通高等学校招生全国统一考试理科数学样卷(十)(已下线)《高频考点解密》—解密16 空间向量与立体几何(已下线)解密15 空间向量与立体几何 (讲义)-【高频考点解密】2021年高考数学(理)二轮复习讲义+分层训练