名校
解题方法
1 . 在
中,角
,
,
所对的边分别为
,
,
,已知
,且
的外接圆的半径为
.
(1)证明:
;
(2)若
,求
的面积.
![](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/01e83f77cd56f9781dd84b0fd388f106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57cdc66e435de8c70232bc5f5ff4b703.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe7a93172d308a58200e3c722fe1072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2022-11-15更新
|
369次组卷
|
3卷引用:福建省2023届高三上学期11月联合测评数学试题
名校
解题方法
2 . 在锐角
中,角
,
,
所对的边为
,
,
,且
.
(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/df4cc62df6ed8a3ec3278d2c2a0ff311.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5a9a60bd5c71dc9b00f98c174827a7.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b246aa3b56becc905d3fb64c6d5ec4a.png)
您最近一年使用:0次
2022-11-04更新
|
1715次组卷
|
5卷引用:福建省福鼎市第六中学2022-2023学年高三上学期12月月考试数学试题
福建省福鼎市第六中学2022-2023学年高三上学期12月月考试数学试题四川省绵阳市2023届高三上学期第一次诊断性考试理科数学试题四川省绵阳八一中学2022-2023学年高三上学期第三次模拟考试数学理科试题河南省信阳高级中学2023届高三下学期开学考试文科数学试题(已下线)专题12 正余弦定理妙解三角形问题和最值问题 (11大核心考点)(讲义)
解题方法
3 . 在
中,内角A,B,C所对的边分别为a,b,c.且
.
(1)求证:
;
(2)若D为AC的中点,
.求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3a1e1c7f01ebb479b9677dcf037e6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28f7c3140b3d547f253c3a5188a2011d.png)
(2)若D为AC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78002bca853929365a3f58082f3e7637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
您最近一年使用:0次
名校
解题方法
4 . 记
的内角
,
,
的对边分别为
,
,
.已知
,点
在边
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(1)证明:
;
(2)若
,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/925ccda7426be0f6d64ea83bda7bba41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c4df7f9b02883ccf02f0d835fa4fb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d542372cae07ffce35fc1a5b0cc212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
您最近一年使用:0次
2022-05-06更新
|
2534次组卷
|
7卷引用:福建省福州市2022届高三5月质量检测数学试题
5 . 如图,在棱长为3的正方体
中.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/e56cebb3-feee-4057-99dd-621a9162708e.png?resizew=172)
(1)求证:
平面
;
(2)若
平面
,求证:点E为
的中心;
(3)若点P是平面
内一个动点,且
,求直线
与平面
所成角大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/e56cebb3-feee-4057-99dd-621a9162708e.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f904c1eed0804b9347c206ea167f1aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de463c3f6401db291b00653cf2873b2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7988923407b9abb78ef8ab45829678fa.png)
(3)若点P是平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4cb0229fa724c87461d1ab83efb747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655c413f509068d30b165f9d92bdba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9539f8fb13345b449274b67bbda995db.png)
您最近一年使用:0次
解题方法
6 .
的内角
,
,
所对的边分别为
,
,
,
.
(1)求
;
(2)若
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb925cdca1e3aef18b1c907c09bda580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25504683f7f3ab3008ba5b9f38018557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
.
![](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/5bf0cb059cd69f3755b3f2789dbba95c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d1be53927ad5b4557b8fc7e219bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb925cdca1e3aef18b1c907c09bda580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25504683f7f3ab3008ba5b9f38018557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0113fd4c7d157757571f9a009e02af.png)
您最近一年使用:0次
2022-07-09更新
|
283次组卷
|
2卷引用:福建省南平市2021-2022学年高一下学期期末质量检测数学试题
名校
解题方法
7 . 已知
的内角A,B,C的对边分别为a,b,c,面积为S,满足
.
(1)证明![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a93c05337d718428222cced9e91d06.png)
(2)求所有正整数k,m的值,使得
和
同时成立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5bdcd8cdc2c065464b018447307a77a.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a93c05337d718428222cced9e91d06.png)
(2)求所有正整数k,m的值,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d3487d0bd7b90ca3a6f34c58d34154.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93c830d8faa17e4c1310f7d255e77781.png)
您最近一年使用:0次
2022-10-11更新
|
1756次组卷
|
5卷引用:福建省泉州市安溪铭选中学2024届高三下学期4月质量检测数学试题
福建省泉州市安溪铭选中学2024届高三下学期4月质量检测数学试题江苏省苏州大学2022届高三下学期5月高考前指导数学试题广东省六校联盟2023届高三上学期第二次联考数学试题(已下线)安徽省江南十校2022届高三下学期3月一模理科数学试题变式题16-20江苏省四校(无锡市辅仁高级中学、江阴高中、宜兴一中、常州市北郊中学)2022-2023学年高三下学期4月阶段性测试数学试题
解题方法
8 . 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
解题方法
9 . 在
中,角
,
,
的对边分别为
,
,
.已知
,且
.
(1)证明:
;
(2)若
的外接圆半径为
,求
的面积.
![](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/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c2ed2ad0a712d59b9c8b4e31233b3e7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e071985acbaff6d458297e1488f4e1d4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2022-09-14更新
|
819次组卷
|
3卷引用:福建省福州第三中学2023届高三上学期第四次质量检测数学试题
10 . 已知
中,a,b,c分别为内角A,B,C的对边,且满足
.
(1)求角A;
(2)设点D为上BC一点,且AD=2,证明:若 ,则
存在最大值或最小值;请在下面的两个条件中选择一个填到上面的横线上,并证明.
①AD是
的中线;
②AD是
的角平分线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdce1e43ac008aab46ca9ecfde7a3f22.png)
(1)求角A;
(2)设点D为上BC一点,且AD=2,证明:若 ,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
①AD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②AD是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次