解题方法
1 . 如图,在
中,内角
的对边分别为
,若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac441403f2b8f5f95586f4e44d71f4d.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992746283638784/2993997107412992/STEM/42f089ca-8dc0-4924-b80b-7cec104b15ce.png?resizew=121)
(1)求角
大小;
(2)若
,证明:
四点共圆;
(3)求四边形
面积最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a806a8539feac15ac486469b87587d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac441403f2b8f5f95586f4e44d71f4d.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992746283638784/2993997107412992/STEM/42f089ca-8dc0-4924-b80b-7cec104b15ce.png?resizew=121)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b32167424064511aa8224c78e06e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解题方法
2 . 在钝角△ABC中,角A,B,C的对边分别为a,b,c,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13711e1d76f59d0549378463a87cb591.png)
(1)证明
;
(2)若
,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13711e1d76f59d0549378463a87cb591.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28956ebf0ebd38adb583b9970f9f8c6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07480ad1e350b7d333d62ecab8601eab.png)
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2022-07-10更新
|
438次组卷
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2卷引用:湖北省部分市州2021-2022学年高一下学期7月期末联考数学试题
名校
解题方法
3 . 我国汉代数学家赵爽为了证明勾股定理,创造了一幅“勾股圆方图”,后人称其为“赵爽弦图”.类比赵爽弦图,用
个全等的小三角形拼成了如图所示的等边
,若
的边长为
,则
的最小值为( )
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941801117802496/2942977848033280/STEM/2aae1abd-06e1-412a-b17d-db0ca946034e.png?resizew=201)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32c94eebcd745ffea7b9f3c760e45b4.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941801117802496/2942977848033280/STEM/2aae1abd-06e1-412a-b17d-db0ca946034e.png?resizew=201)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-03-24更新
|
656次组卷
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4卷引用:湖北省部分学校2021-2022学年高一下学期3月联考数学试题
湖北省部分学校2021-2022学年高一下学期3月联考数学试题河南省中原好教育联盟2021-2022学年高一下学期第二次联考数学试题(已下线)第六章 平面向量及其应用(基础、典型、易错、压轴)分类专项训练(2)(已下线)专题2 赵爽弦图
名校
解题方法
4 . 在锐角△ABC中,内角A,B,C所对的边分别是a,b,c.已知
.
(1)证明:
.
(2)求函数
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cb8b55fd08729dcf5b9365fbd62217.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e927b0413958ff1596ee8ce00a885d78.png)
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2022-06-06更新
|
720次组卷
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5卷引用:湖北省部分学校2021-2022学年高一下学期6月联考数学试题
解题方法
5 . 在①c=2bcos A,asin A-bsin B=c(sin C-sin B);②△ABC的面积S满足
,且
这两组条件中任选一组,补充在下面问题中,并作答.
已知
ABC的内角A,B,C所对的边分别是a,b,c,若___,则△ABC是否为等边三角形?若是,写出证明;若不是,说明理由.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c49b13a48936af70d16d940c926c1b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a115b91b3197f7ab0a494bb9ebf3ee.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
名校
6 . 如图,三棱锥
中,
为等边三角形,且面
面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/a66c6e4d-736f-4ce6-92ee-1a7baac164e0.png?resizew=167)
(1)求证:
;
(2)当
与平面BCD所成角为45°时,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/a66c6e4d-736f-4ce6-92ee-1a7baac164e0.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2898853a3396f0878af9eac934416d.png)
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2022-01-21更新
|
1472次组卷
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5卷引用:湖北省黄冈市浠水县第一中学2022-2023学年高一下学期期末数学试题
解题方法
7 . 已知
的内角A,B,C的对边分别为a,b,c,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/96e3c4ab-c88e-41f3-932f-1f0c81c856ba.png?resizew=98)
(1)证明:
;
(2)如图,设D为BC边的中点,点E在AB边上,满足
,且
,四边形ACDE的面积为
,求线段CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e289885f61af21a6a78d68cd1e7588c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/96e3c4ab-c88e-41f3-932f-1f0c81c856ba.png?resizew=98)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)如图,设D为BC边的中点,点E在AB边上,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eb9cacaa999310042a42cd26e12c274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25948269cbc72ca1e2aa10ca731d18a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c75cb41e05075b1c3e2b3199df5eb9.png)
您最近一年使用:0次
名校
解题方法
8 . 如图,在直四棱柱
中,四边形ABCD是平行四边形,F是
的中点,点E是线段
上,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/29/2990018058854400/2992049194172416/STEM/0f9968e7-9836-4dd2-bd3b-8d6b6dd3148b.png?resizew=172)
(1)证明:直线
平面BDE.
(2)若
,
,
,求点F到平面BDE的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c106120d2ae21e8a2f42f58b02fc153a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/29/2990018058854400/2992049194172416/STEM/0f9968e7-9836-4dd2-bd3b-8d6b6dd3148b.png?resizew=172)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9c89e28bb3b5ce434e8ebea6363339.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/effe791cf7422d81981f7f188e30dd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
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2022-06-01更新
|
494次组卷
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3卷引用:湖北省部分学校2021-2022学年高一下学期6月联考数学试题
湖北省部分学校2021-2022学年高一下学期6月联考数学试题河南省创新发展联盟2021-2022学年高一下学期阶段性检测(四)数学试题(已下线)第02讲 玩转立体几何中的角度、体积、距离问题-2022年暑假高一升高二数学衔接知识自学讲义(人教A版2019)
9 . 已知a、b、c分别为
三个内角A、B、C的对边,且
.
(1)证明:
;
(2)若
,且
为锐角三角形,求
周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2df569a50e11cda1a1b55b7a54c0435.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2022-03-22更新
|
843次组卷
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2卷引用:湖北省夷陵中学、襄阳四中、随州一中2021-2022学年高一下学期3月联考数学试题
2022高一·全国·专题练习
名校
解题方法
10 . 设
的内角
,
,
的对边分别为
,
,
,
,且
为钝角.
(1)证明:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c91bba3192283b38f1fde918fb03c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85575404e6f7295f6aa2906b6a077475.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a5801e8be81aae66c47cc058fe370c.png)
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