名校
1 . 如图,在等腰直角三角形
中,
分别是
上的点,且
分别为
的中点,现将
沿
折起,得到四棱锥
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23853b5555468f9d803713d1d9353750.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3e6740be-3953-4f28-91ea-930c1735e3f6.png?resizew=400)
(1)证明:
平面
;
(2)在翻折的过程中,当
时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084ce748ea72556d4d575d84d0ea594f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6b04dcd5a34b8125696faf552ab63f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79c1b3d8a1ea4d9370996706199e5a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0fa96c746ceab61c043cbb95b7d2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23853b5555468f9d803713d1d9353750.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/3e6740be-3953-4f28-91ea-930c1735e3f6.png?resizew=400)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)在翻折的过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
您最近一年使用:0次
2022-06-18更新
|
1513次组卷
|
11卷引用:湖北省宜昌市示范高中教学协作体2021-2022学年高二上学期期中数学试题
湖北省宜昌市示范高中教学协作体2021-2022学年高二上学期期中数学试题陕西省西安市长安区第一中学2020-2021学年高二上学期期末数学(理)试题安徽省淮南一中2020-2021学年高二下学期开学考理科数学试题安徽省江淮名校2020-2021学年高二下学期开学联考数学(理)试题(已下线)专题9.10—立体几何—二面角2—2022届高三数学一轮复习精讲精练贵州省遵义市第五中学2021-2022学年高二上学期期中考试数学(理)试题福建省福州第一中学2021-2022学年高一下学期期末考试数学试题吉林省松原市宁江区吉林油田高级中学2021-2022学年高二上学期期初数学考试试题(已下线)专题24 立体几何解答题最全归纳总结-1(已下线)第07讲 向量法求距离、探索性及折叠问题 (练)(已下线)1.2.4 二面角
2 . 如图1,在直角梯形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
,点
为
的中点,点
在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94214b5db2aaa2f0ec33fb3364237b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,将四边形
沿
边折起,如图2.
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951134094770176/2954224430669824/STEM/ff8fb79c-00a1-4412-bd2e-c030bd31e7e4.png?resizew=279)
(1)证明:图2中的![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
平面
;
(2)在图2中,若
,求该几何体的体积.
![](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/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94214b5db2aaa2f0ec33fb3364237b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f08ff2c55514a933ae4c57e091d1a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f3df5713a423887c16e6355236372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/4/4/2951134094770176/2954224430669824/STEM/ff8fb79c-00a1-4412-bd2e-c030bd31e7e4.png?resizew=279)
(1)证明:图2中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)在图2中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
您最近一年使用:0次
2022-04-09更新
|
1888次组卷
|
7卷引用:湖北省十堰市丹江口市第一中学2021-2022学年高一下学期期末数学试题
湖北省十堰市丹江口市第一中学2021-2022学年高一下学期期末数学试题四川省攀枝花市2022届高三第二次统一考试文科数学试题(已下线)8.5.3 平面与平面平行 (精讲)(2)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)四川省绵阳南山中学2023届高三下学期4月绵阳三诊热身考试文科数学试题四川省阆中中学校2023届高三第五次检测(二模)数学(文)试题安徽省六安第一中学2023届高考适应性考试数学试题江西省赣州市2023届高三模考押题卷(二)数学试题
名校
解题方法
3 . 如图,在四面体A-BCD中,AB⊥平面BCD,BC⊥CD,BC=2,∠CBD=
,E、F、Q分别为BC、BD、AB边的中点,P为AD边上任意一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/d4af287d-9e2d-4522-a3b7-9bfd785b4b2a.png?resizew=148)
(1)证明:CP
平面QEF.
(2)当二面角B-QF-E的平面角为
时,求AB的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/d4af287d-9e2d-4522-a3b7-9bfd785b4b2a.png?resizew=148)
(1)证明:CP
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(2)当二面角B-QF-E的平面角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
您最近一年使用:0次
2021-12-04更新
|
1324次组卷
|
6卷引用:湖北省武汉市五校联合体2020-2021学年高一下学期期末数学试题
名校
解题方法
4 . 如图,在三棱锥
中,
平面
,
,
.求证:
;
(2)若
,
分别在棱
,
上,且
,
,问在棱
上是否存在一点
,使得
平面
.若存在,则求出
的值;若不存在.请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c71dbf267939080668be464f1aa60da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(2)若
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760e8882e84ecd68bc889a55efce5d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d3f076d3f5a78fc081c252e9a55d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/261fbbc173664b0047448fef17763dfb.png)
您最近一年使用:0次
2021-08-07更新
|
625次组卷
|
6卷引用:湖北省荆州市沙市中学2022-2023学年高二上学期第一次月考数学试题
名校
解题方法
5 . 如图,
是边长为2的等边三角形,平面
平面ABC,且
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/9e8bb84d-b9bf-4ea1-a6db-d25c7cfc4786.png?resizew=222)
(1)求证:
平面ABC;
(2)求平面ABC与平面BEF所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c99e6d75d606b5cae9392ecca969200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee73d6253a130741216c1a28727de30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa18c2a78c400c80a5760743f31771c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089bf1fe65e136185c5ec7cb29c43e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70abed7faf55deb24162255c5ad59577.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/9e8bb84d-b9bf-4ea1-a6db-d25c7cfc4786.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
(2)求平面ABC与平面BEF所成锐二面角的余弦值.
您最近一年使用:0次
2021-05-23更新
|
731次组卷
|
2卷引用:湖北省部分省级示范高中2020-2021学年高二下学期期末数学试题
名校
解题方法
6 . 如图,在三棱柱ABC-A1B1C1中,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/be12cd0d-b264-49de-a009-b1bb520b7b3e.png?resizew=154)
(1)若此三棱柱为正三棱柱,且
,求异面直线
与
所成角的大小;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/be12cd0d-b264-49de-a009-b1bb520b7b3e.png?resizew=154)
(1)若此三棱柱为正三棱柱,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4991ea372d13c03461e8b2a8808ef91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e04f01e371223cdae8da2466686b560.png)
您最近一年使用:0次
2021-02-02更新
|
1452次组卷
|
2卷引用:湖北省随州市第一中学2020-2021学年高一下学期期中数学试题
解题方法
7 . 如图,在三棱柱
中,侧棱
底面
是
中点,
是
中点,
是
与
的交点,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690608992387072/2690649550749696/STEM/4e06bd37-7ae6-4dae-9845-c2633b2cde03.png)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(2)求点
到平面
的距离
![](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/d1ccf3d4def4b634525240bc671a2860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee16c91119c5601a7c93a6642c95e7f8.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690608992387072/2690649550749696/STEM/4e06bd37-7ae6-4dae-9845-c2633b2cde03.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72221ee5b504d596ff799c0b356aa0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4e7552a39c412d882766dbcd7eeb69.png)
您最近一年使用:0次
2021-04-01更新
|
1817次组卷
|
6卷引用:湖北省部分重点高中2020-2021学年高一下学期四月联考数学试题
解题方法
8 . 如图,四棱柱
的底面为菱形,
为
中点,
为
中点,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/cf02d440-b8fe-4498-9f48-1d5927f7215e.png?resizew=141)
(1)证明:直线
平面
;
(2)若
平面
,
,
,
,求平面
与平面
所成的锐二面角的余弦值.
![](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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/cf02d440-b8fe-4498-9f48-1d5927f7215e.png?resizew=141)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc674d2604ff270dd6abc66b35e86e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
(2)若
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8a20c1fc8a5620db5db3a74eb01201.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66715c82a022f2c829e09d057bdb78e9.png)
您最近一年使用:0次
9 . 如图,四棱锥
中,
平面
,
,
,
,
为棱
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/d6f4f9b7-c77d-4fc7-bad3-64e2488cfd92.png?resizew=235)
(1)若
,证明:
平面
;
(2)若
,且
平面
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.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/editorImg/2022/12/23/d6f4f9b7-c77d-4fc7-bad3-64e2488cfd92.png?resizew=235)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fd089cdee8bb2aaa65a4cd2597398d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982d01f052709b72afeaf1015fc7acc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931bbffda5e872703c9947eccc47ede2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c2b786c64e6a9ed2ec5670cde74f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f239fbcc58fc15535db4b5084c4f7253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f239fbcc58fc15535db4b5084c4f7253.png)
您最近一年使用:0次
10 . 如图1,直角梯形
中,
,
,E、F分别是
和
上的点,且
,
,
,沿
将四边形
折起,如图2,使
与
所成的角为60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/8345f9bb-7b4d-4a59-b299-9f9393720fd1.png?resizew=368)
(1)求证:
平面
;
(2)M为
上的点,
,若二面角
的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.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/5c91baecb97fadd4f8ab49e6effcbc04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7d94248232b97c968056125b689106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/8345f9bb-7b4d-4a59-b299-9f9393720fd1.png?resizew=368)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963a91995abd4927d75406d16e10a81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
(2)M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c742ec955b0d2314be4cc9897845e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6306a5c48c6a2b30eb0c6548c1b99ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e468f168f3657d84d44be5eb89a62d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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