名校
解题方法
1 . 如图所示,在三棱柱
中,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/33edfb9e-ad6c-46dc-8567-910f111f02b4.png?resizew=211)
(1)求证:
平面
;
(2)若
是棱
的中点,在棱
上是否存在一点
,使得
//平面
?若存在,请确定点
的位置:若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c1aa394528058e6676768b49c95e44.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/33edfb9e-ad6c-46dc-8567-910f111f02b4.png?resizew=211)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
解题方法
2 . 平面凸六边形
的边长相等,其中
为矩形,
.将
,
分别沿
,
折至
,
,且均在同侧与平面
垂直,连接
,如图所示,E,G分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474461593632768/2477230549655552/STEM/715a0606-c0d1-4972-9cde-0ccadadaf06b.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474461593632768/2477230549655552/STEM/eccc12c0-0c61-44b9-a28e-09fa4c98c6d5.png?resizew=242)
(1)求证:多面体
为直三棱柱;
(2)求二面角
平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5964426fda51d1e7c8ede53cbfa0d1bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41c8712cbcbb63b2f8fe556c393b135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb944298f2edd73422dea55fd25f0dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474461593632768/2477230549655552/STEM/715a0606-c0d1-4972-9cde-0ccadadaf06b.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2020/5/31/2474461593632768/2477230549655552/STEM/eccc12c0-0c61-44b9-a28e-09fa4c98c6d5.png?resizew=242)
(1)求证:多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d9dd0666070c144ed761cce26ab076.png)
您最近一年使用:0次
名校
解题方法
3 . 如图,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4670cf6b3eff7baded7f866411cc7a13.png)
平面
,
为矩形,
为等腰梯形,
,
分别为
,
中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/04001428-c164-4abb-a9e4-865b7d08bca4.png?resizew=189)
(1)证明:
平面
;
(2)求二面角
的正弦值;
(3)线段
上是否存在点
,使得
平面
,若存在求出
的长,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4670cf6b3eff7baded7f866411cc7a13.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/4670cf6b3eff7baded7f866411cc7a13.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1310d0cfa1dc445d8c0fd253e240e40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/04001428-c164-4abb-a9e4-865b7d08bca4.png?resizew=189)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4670cf6b3eff7baded7f866411cc7a13.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281177cc5c7e6294a474dc64ee02aa29.png)
(3)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9edd2e61629ddf4c758808838d4478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
您最近一年使用:0次
2020-05-28更新
|
709次组卷
|
2卷引用:天津市十二区县重点学校2020届高三下学期毕业班联考(一)数学试题
20-21高二·全国·课后作业
4 . 如果一条直线垂直于一个平面内的(1)三角形的两条边;(2)梯形的两条边;(3)圆的两条直径.分别判断这条直线是否与平面垂直,并说明理由.
您最近一年使用:0次
2020-01-31更新
|
135次组卷
|
3卷引用:第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直
(已下线)第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直人教B版(2019) 必修第四册 逆袭之路 第十一章 立体几何初步 11.4.1 直线与平面垂直人教B版(2019)必修第四册课本习题11.4.1 直线与平面垂直
20-21高二·全国·课后作业
5 . 如图,拿一张矩形的纸对折后略微展开,竖立在桌面上,说明折痕为什么和桌面垂直.
您最近一年使用:0次
2020-01-31更新
|
137次组卷
|
3卷引用:第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直
(已下线)第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直人教B版(2019) 必修第四册 逆袭之路 第十一章 立体几何初步 11.4.1 直线与平面垂直人教B版(2019)必修第四册课本习题11.4.1 直线与平面垂直
6 . 三角形的两边,可以同时垂直于同一个平面吗?说明理由.
您最近一年使用:0次
2020-01-31更新
|
216次组卷
|
4卷引用:第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直
(已下线)第十一章 立体几何初步 11.4 空间中的垂直关系 11.4.1 直线与平面垂直人教B版(2019) 必修第四册 逆袭之路 第十一章 立体几何初步 11.4.1 直线与平面垂直人教B版(2019)必修第四册课本习题11.4.1 直线与平面垂直(已下线)第四章 立体几何解题通法 专题一 反证法 微点2 立体几何中的反证法(二)【培优版】
解题方法
7 . 如图,在三棱锥
中,
,
,
,
,
为线段
的中点,
为线段
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/7eea6f27-89ef-4ff0-86dc-3b8a4fc7d4c0.png?resizew=191)
(1)求证:
;
(2)当
平面
时,若三棱锥
的体积为
,求
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88b2cf75a92be236757bce120d5100d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/7eea6f27-89ef-4ff0-86dc-3b8a4fc7d4c0.png?resizew=191)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/373f735f0f04d11f1951eaef1bb78b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42020cfacd62b300cad053981bab9e0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
2020-04-12更新
|
691次组卷
|
2卷引用:中原金科大联考2019-2020学年高三4月质量检测数学(文)试题
名校
解题方法
8 . 面
外一点P,
两两互相垂直,过
的中点D作
面
,且
,连
,多面体
的体积是
.
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508514193408/2522619224358912/STEM/edfaaec335f1490191bda73d3fe4e8ad.png?resizew=224)
(1)画出面
与面
的交线,说明理由;
(2)求
与面
所成的角正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1361092e790e4154a14aea9d0db65a9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d8d517cdb64fec3197ab00c3fddb49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e06b70cb64cae00286ae48739ba04455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f3f1fed9719cd978ff46a7634a62e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/5/2521508514193408/2522619224358912/STEM/edfaaec335f1490191bda73d3fe4e8ad.png?resizew=224)
(1)画出面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd92fe3fef69971e192dcd23a02374b.png)
您最近一年使用:0次
解题方法
9 . 如图,在四棱锥
中,底面
是矩形,
,
,
是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2ca3ae2f-be89-4367-b549-9cb75aeab6c6.png?resizew=213)
(1)求证:
平面
;
(2)在棱
上是否存在点
,使得
平面
?并说明理由.
![](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/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/2ca3ae2f-be89-4367-b549-9cb75aeab6c6.png?resizew=213)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9edd2e61629ddf4c758808838d4478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a619288429fb6f75cc51f6c7fa43d03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f1bb063892dfd8f301d327e2f68feb.png)
您最近一年使用:0次
10 . 如图,四边形
为矩形,
,
,
为线段
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/fec78456-6abd-47c4-abc8-5fb3827fa518.png?resizew=168)
(1)若
为线段
的中点,求证:
平面
;
(2)若三棱锥
的体积记为
,四棱锥
的体积记为
,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49da41170a32e14b6b09d7031e7c1a62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fad13c99af5791d396fe3137727c9a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/fec78456-6abd-47c4-abc8-5fb3827fa518.png?resizew=168)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6053e396df2cd152e1329fce766d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53bdef2e7a7929ad6190302ab44c46c0.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfc470aaef9ba9870a7f9264feee39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a20cdabc328d6bd9b69c97ed892ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb77e46b82b1edbf990e0d0577381932.png)
您最近一年使用:0次
2020-02-07更新
|
357次组卷
|
2卷引用:2020届安徽省蚌埠市高三上学期期末考试数学(理)试题