名校
解题方法
1 . 如图,在△ABC中,D是AC边上一点,∠ABC为钝角,∠DBC=90°.
![](https://img.xkw.com/dksih/QBM/2022/8/28/3054430287618048/3054944911024128/STEM/f589aa2d68534a9787bec02559bcceac.png?resizew=191)
(1)证明:
;
(2)若
,
,再从下面①②中选取一个作为条件,求△ABD的面积.
①
;②
.
![](https://img.xkw.com/dksih/QBM/2022/8/28/3054430287618048/3054944911024128/STEM/f589aa2d68534a9787bec02559bcceac.png?resizew=191)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea7721cb3cc3bc9a837805df2be00e6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8b709a173120436dac669c74b927d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb3f56ccf86476f99c1cb18fc7cca21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98a8ee55f8d77e8a669cea6c0c7547c.png)
您最近一年使用:0次
2022-08-29更新
|
1816次组卷
|
10卷引用:福建省厦门外国语学校2023届高三上学期第一次月考数学试题
福建省厦门外国语学校2023届高三上学期第一次月考数学试题贵州省普通高等学校招生2022届高三适应性测试数学(理)试题贵州省普通高等学校招生2022届高三适应性测试数学(文)试题(已下线)回归教材重难点02 三角函数与解三角形-【查漏补缺】2022年高考数学(理)三轮冲刺过关(已下线)3.5 正余弦定理(精讲)-【一隅三反】2023年高考数学一轮复习(基础版)(新高考地区专用)湖南省长沙市麓山国际实验学校2022-2023学年高三上学期入学考试数学试题(已下线)专题14 解三角形图形类问题-1(已下线)专题20 解三角形-1(已下线)微专题09 解三角形图形类问题(1)-【微专题】2022-2023学年高一数学常考点微专题提分精练(人教A版2019必修第二册)(已下线)专题3-4解三角形大题综合归类-2
解题方法
2 . 在
中,角
,
,
所对的边分别为
,
,
,已知
,
.
(1)证明:
为等腰三角形;
(2)设
的面积为
,若___________,求
的值.
在①
;②
;③
三个选项中,选择一个填入上面空白处,并求解.
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/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/972e5ccbddccd59cd01d527de1df4732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
在①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9738860054352b2eb02cb52151d6ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5685db855001f3faeb334f938d91f0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b102b99ebf1ef569a749de404b417027.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
3 . 已知在
中,角
,
,
的对边分别为
.
(1)若边
的中线
长为3,对
,且
,
恒成立,试判断“
”是否成立?
(2)若
为非直角三角形,且
,其中
.
(ⅰ)证明:
;
(ⅱ)是否存在函数
,使得对于一切满足条件的
,代数式
恒为定值?若存在,请给出一个满足条件的
,并证明之;若不存在,请给出一个理由.
参考公式:
![](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/76f0649064a085fb74c997fb507a9b6d.png)
(1)若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401356a5a167a13d7d6f18d2ece74e06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b0825a2026807a12ab8854fc4069ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9cf280583216056f5141a573902becf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e34f42b3be15518c29e3689c9fe6d6d.png)
(ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18c985cbe661f18eef831dcbc56f9cc.png)
(ⅱ)是否存在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d02e53c661fa645fd6b9f24b2bd4e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14148de187fece2b017872c2324aad1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d02e53c661fa645fd6b9f24b2bd4e51.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/889623d5e61054f38a35aedd644c9ff5.png)
您最近一年使用:0次
2022-06-07更新
|
504次组卷
|
2卷引用:福建省德化一中、永安一中、漳平一中三校协作2021-2022学年高一5月联考数学试题
名校
4 . 记
的内角
,
,
的对边分别为
,
,
,点
在边
上,且满足
,
的面积![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b678e9ab75e74a2c10bbc88594498a.png)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dddab8e14a19fb0ad6c6bfffb7f7f0.png)
(2)求
.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc5df316d55e11b303a1bcc7885826a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b678e9ab75e74a2c10bbc88594498a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dddab8e14a19fb0ad6c6bfffb7f7f0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d54d09ef825305de83671448a3dea21.png)
您最近一年使用:0次
5 . 在△ABC中,D是边BC上一点,且BD=1,CD=3,∠BAD=30°,∠CAD=90°.
(1)证明:
;
(2)求△ABC的面积.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a17079bda8e00936650c3910223df74c.png)
(2)求△ABC的面积.
您最近一年使用:0次
2021-12-11更新
|
347次组卷
|
2卷引用:福建省泉州市安溪一中、泉州实验中学、养正中学2022届高三下学期期初联考数学试题
解题方法
6 . 在
中,角
的对边分别为
,满足
且
.
(1)求证:
;
(2)若
,求
的面积的最大值.
![](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/62f676f4d2c3cf5ab66b2a41f69f11a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5190c074686d855c0ddba05bb238fe99.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc20d351d51723c9b0a07a20ac14114.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
7 . 如图,在平面四边形
中,
.
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977795042992128/2981274279411712/STEM/f695d722-6425-46ab-87cb-f8fca69c2564.png?resizew=159)
(1)证明:
;
(2)记
与
的面积分别为
和
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f02a1f15e74d8998378dcdceebe5aaa.png)
![](https://img.xkw.com/dksih/QBM/2022/5/12/2977795042992128/2981274279411712/STEM/f695d722-6425-46ab-87cb-f8fca69c2564.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5aaa7eeb1a7ae44986483341f72a69.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be89b91f05f281190209b1e876299d57.png)
您最近一年使用:0次
2022-05-17更新
|
1526次组卷
|
11卷引用:福建省厦门集美中学2022届高三下学期适应性考试(最后一卷)数学试题
福建省厦门集美中学2022届高三下学期适应性考试(最后一卷)数学试题福建省莆田第二十五中学2023届高三上学期期中考试数学试题山东省菏泽市(二中系列校)2020-2021学年高三上学期期末考试数学试题(B)试题云南省保山市昌宁县2021-2022学年高一下学期期中考试数学试题(已下线)第05练 余弦定理 -2022年【暑假分层作业】高一数学(人教A版2019必修第二册)(已下线)专题13 解三角形(已下线)专题4-5 解三角形大题归类 -2河北省廊坊市三河市第三中学2023届高三上学期第一次段考数学试题(已下线)专题12 解三角形综合-1(已下线)拓展三:三角形面积(定值,最值,范围)问题(精讲)-【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)(已下线)专题3-4解三角形大题综合归类-2
名校
解题方法
8 . 如图,在四边形
中,
.
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982837147811840/2983242790002688/STEM/2af2bb88-c83c-4518-861f-b914eb6664fa.png?resizew=205)
(1)证明:
为直角三角形;
(2)若
,求四边形
面积S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671971c21231cc0d5bd1be98d52c91e1.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982837147811840/2983242790002688/STEM/2af2bb88-c83c-4518-861f-b914eb6664fa.png?resizew=205)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2022-05-20更新
|
1569次组卷
|
4卷引用:福建省龙岩市上杭县第一中学2022届高三下学期5月模拟考数学试题
福建省龙岩市上杭县第一中学2022届高三下学期5月模拟考数学试题河北省唐山市2022届高三三模数学试题(已下线)专题3-2 解三角形最值范围与图形归类(讲+练)-2(已下线)专题3-4解三角形大题综合归类-2
名校
9 . 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
|
1491次组卷
|
5卷引用:福建省华安县第一中学2022-2023学年高一下学期期末考试数学模拟试题
名校
解题方法
10 . 从①
,②
,③
这三个条件中任选一个,补充在下面的问题中,并加以解答.
已知△ABC的内角A,B,C所对的边分别为a,b,c,若___________,且
,证明:△ABC是等边三角形.
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/aeed1530d994004214b94e1b43b9ec39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80b6a016dbcf4d5ceadb8ba741829ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a565df2a9827e9727dc2f0dbf6d925e.png)
已知△ABC的内角A,B,C所对的边分别为a,b,c,若___________,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.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