名校
解题方法
1 . 如图,在三棱柱
中,侧面
为正方形,
平面ABC,
,
,E,F分别为棱AB和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/565f186d-a895-45c4-9a6b-4555461a3994.png?resizew=178)
(1)在棱
上是否存在一点D,使得
平面EFC?若存在,确定点D的位置,并给出证明;若不存在,试说明理由;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/565f186d-a895-45c4-9a6b-4555461a3994.png?resizew=178)
(1)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8355349fbe4f1ff9350e411a621b4d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0adfdc9ada431b02ecf9858a2eab2506.png)
您最近一年使用:0次
2022-12-30更新
|
1048次组卷
|
6卷引用:四川省眉山市2023届高三第一次诊断性考试数学(文)试题
四川省眉山市2023届高三第一次诊断性考试数学(文)试题四川省资阳市2023届高三第二次诊断性考试文科数学试题四川省雅安市2023届高三第一次诊断性考试数学(文)试题(已下线)8.6.3平面与平面垂直(第2课时平面与平面垂直的性质定理)(精练)-【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)四川省成都市成都外国语学校2022-2023学年高三上学期期末数学文科试题四川省广安市2023届高三第一次诊断性考试数学(文)试题
名校
2 . 如图,
是边长为
的等边三角形,四边形
为菱形,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/0334c950-7d0c-46d3-a8b0-44e738a91f93.png?resizew=170)
(1)求证:
平面
;
(2)求平面
与平面
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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c99e6d75d606b5cae9392ecca969200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59567dbf014b5608475254efb2cf2c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a8d8fe0503af1c8f8d04eaf211bac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70abed7faf55deb24162255c5ad59577.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/0334c950-7d0c-46d3-a8b0-44e738a91f93.png?resizew=170)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
名校
解题方法
3 . 在四棱锥
中,
平面
,
,
,
,
为
的中点,
为
的中点
.
(1)线段
的中点为
,求证
平面
;
(2)若异面直线
与
所成角的余弦值为
,求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/71e90f9f4e44173888a54c624852064a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e62ca104bd39a1646922b5836f1826b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0963f1eecde5d06fe95d91f622fca7e6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/280b458f-4210-4d47-80b5-07eb281f3b06.png?resizew=189)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a041e768d10a0d59d95e1bbef881261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59841953d876e61083ababe8ad616dc.png)
(2)若异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1daa0856a5f94a9c08df27f4db785c76.png)
您最近一年使用:0次
名校
4 . 如图,
平面
,
,
,
,
,
.
(1)求证:
平面ADE;
(2)求直线
与平面
所成角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e952f7b05d06917128bfecb64fe3cf.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/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411d1139c919736044af6379743b3d5c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/969c133f-90d5-4249-b502-93945700d5df.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
2023-10-17更新
|
492次组卷
|
3卷引用:黑龙江省大庆第一中学2023-2024学年高二上学期第二次验收考试数学试题
名校
解题方法
5 . 如图,在四棱锥
中,底面
是平行四边形,
分别为
上的点,且
.
(1)证明:
平面
;
(2)若
平面
为
的中点,
,求二面角
的正切值.
![](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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac4ee9a98647379757a6f643fb73438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c781fc002d462d7be259f2235f63a1f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/657a9728-5e11-4395-a7fa-febb29aa5750.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d46554105150391e671609fc6348a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9068f29d671d76d1e95ba3a4eaff5b96.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d11e19c84255eb0431415c2dec553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a633ce356e31adae2c0f1c4be3bbdfdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baa2f1a925d67fcd406218b83015d13.png)
您最近一年使用:0次
2023-12-27更新
|
539次组卷
|
4卷引用:海南省海口市海口中学2024届高三上学期第四次月考数学试题
海南省海口市海口中学2024届高三上学期第四次月考数学试题(已下线)高二上学期数学期末模拟卷(二)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第一册)山西省山西大学附属中学校2024届高三下学期第一次月考数学试题(已下线)模块六 立体几何(测试)
名校
6 . 如图,在长方体
中,侧面
是正方形,且
,点E为BC的中点,点F在直线
上.
(1)若
平面
,求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f4f0f539f5b418e4c8169b72f96067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/6e793309-44da-4ae7-a663-a7064c18efd5.png?resizew=168)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0447e46f2d9b39960ae1f1294ed8a2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8464f8d92d471c5827bf8c94b6ea12db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94270844f197d524bf1da4f1385befd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8464f8d92d471c5827bf8c94b6ea12db.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45a381a33453534652f66c351379967.png)
您最近一年使用:0次
2023-08-30更新
|
503次组卷
|
3卷引用:北京市2024届新高三入学定位考试数学试题
北京市2024届新高三入学定位考试数学试题北京市东直门中学2024届高三上学期开学考试数学试题(已下线)专题06 二面角4种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教B版2019选择性必修第一册)
名校
7 . 在如图所示的圆柱
中,AB为圆
的直径,
是
的两个三等分点,EA,FC,GB都是圆柱
的母线.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
平面ADE;
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/d8007de3-faa6-44e8-be88-ce79dcdd3739.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3d34e4702615fa0e908eda9440c93c.png)
(2)设BC=1,已知直线AF与平面ACB所成的角为30°,求二面角A—FB—C的余弦值.
您最近一年使用:0次
2020-06-29更新
|
2606次组卷
|
10卷引用:山东省滨州市2020届高三三模考试数学试题
山东省滨州市2020届高三三模考试数学试题(已下线)专题九 立体几何与空间向量-山东省2020二模汇编湖南省长沙市长郡中学2020-2021学年高三上学期月考(三)数学试题山西省怀仁市2020-2021学年高二上学期期中数学(理)试题湖南省岳阳市第一中学2020-2021学年高二下学期第一次质量检测数学试题江苏省盐城中学2021届高三下学期仿真模拟数学试题江西省宜春市天立高级中学2020-2021学年高一下学期期末数学试题四川省巴中市恩阳区2021-2022学年高二上学期期中考试数学试题广东省佛山市南海区、三水区2023届高三上学期8月摸底数学试题四川省宜宾市叙州区第一中学校2022-2023学年高二上学期期中考试数学(理)试题
名校
8 . 如图,在四棱锥
中,底面
正方形,平面
底面
,平面
底面
,
,
分别是
的中点,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
平面
;
(2)求
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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.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/36dc88c2054948a03e74d57b10d3a482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e658d7985a600629fdf01517fc55c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67576cc7b83ee93cfd15154bb2a00c5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/dff7d99f-8875-4564-93ce-c46cc758ab86.png?resizew=173)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96b8c2721ada247b03f41f328539b301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
您最近一年使用:0次
2022-09-16更新
|
1100次组卷
|
4卷引用:广东省汕头市金山中学2023届高三上学期摸底考试数学试题
名校
9 . 如图,正方形
和直角梯形
所在平面互相垂直,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5196057a-6554-4001-8019-85ac67b33f8b.png?resizew=123)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ea9d3df7c2bcdf135dedd1554fb82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce38d8a8a7043586aad206f8153d0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a77f26a7be722e00baa984f769ec8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce84f6062f12bf6ef42d7b733cd2248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/5196057a-6554-4001-8019-85ac67b33f8b.png?resizew=123)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc521258fcaeaf7acffc5ae98c3af6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646084b7f3902efa4c462ed67599265a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
您最近一年使用:0次
2022-09-06更新
|
1015次组卷
|
6卷引用:四川省巴中市2022-2023学年高三上学期零诊考试数学(理科)试题
10 . 如图,在四棱锥
中,底面
为直角梯形,其中![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
,
,
,
平面
,且
,点
在棱
上,点
为
中点.
(1)证明:若
,则直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
平面
;
(2)求二面角
的正弦值;
(3)是否存在点
,使
与平面
所成角的正弦值为
?若存在,求出
的值;若不存在,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/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/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/60e825cb-0b09-4506-8e0c-a91f70113347.png?resizew=168)
(1)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc85ce5e111acf7162b8e1b5a3f6b220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1000f47a7a77a81c2d0bf1b1f8599f.png)
(3)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0467b0675c3ecfb282cc88255284d3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47548785e478bc5b9591341a881e3127.png)
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