名校
解题方法
1 . 记
的内角
所对的边分别为
,已知
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e717c243991f038d7bc21a0fdad985b.png)
(2)若
的面积
,求
的最大值,并证明:当
取最大值时,
为直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55abde5108e7846f496584016ce82286.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e717c243991f038d7bc21a0fdad985b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a88d9c428cc72bdf012746e2781a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2022-12-06更新
|
755次组卷
|
3卷引用:安徽省皖优联盟2022-2023学年高三上学期12月第二次阶段性联考数学试题
名校
解题方法
2 . 如图,直四棱柱
中,侧棱
,底面
是菱形,
,
,
为侧棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/da5dd9fe-09c2-44f8-bdaa-17397a8da412.png?resizew=161)
(1)求证:
;
(2)在棱
上是否存在点
,使得二面角
的大小为
?试证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.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/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/da5dd9fe-09c2-44f8-bdaa-17397a8da412.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68263d477443994e54cea454ae5490e.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf29d1e4a907cf155e00c5baaed0f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
您最近一年使用:0次
名校
解题方法
3 . 在
中,内角
的对边分别为
的面积为
,且
.
(1)证明:
;
(2)若
,求
.
![](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/718b5b48053888ab3b234b8cb56a0fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078e30318231eb60cd787c7b595d3b6b.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8607bde1fa6cde631a46e921d959a0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee49209b78441c35512d86ad426275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa6361e919ac07ee6ed642556e1d1ae.png)
您最近一年使用:0次
7日内更新
|
672次组卷
|
3卷引用:江西省多校联考2023-2024学年高一下学期5月教学质量检测数学试卷
江西省多校联考2023-2024学年高一下学期5月教学质量检测数学试卷江苏省扬州中学2024届高三下学期全真模拟数学试卷(已下线)专题05 解三角形大题常考题型归类-期期末考点大串讲(人教B版2019必修第四册)
解题方法
4 . 已知
的内角A,B,C的对边分别为a,b,c,且
.
(1)证明:C为锐角.
(2)若
的面积为3,
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c256c79e8c4c18fc669412ede195d9.png)
(1)证明:C为锐角.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf4c55e68427cca325cfbddedcf84eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efdce759b9a86d5be2c14b95ae7680b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
您最近一年使用:0次
名校
5 . 在
中,AD是
的角平分线,AE是边BC上的中线,点D、E在边BC上.
(1)用正弦定理证明
;
(2)若
,求DE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
(1)用正弦定理证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c6ba1dce1e32a78ea2f3a85a3c8962.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95d54823e4a9895941d5b88b802670c.png)
您最近一年使用:0次
名校
6 . 在
中,角
、
、
所对的边分别为
、
、
,且满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6947e5cd4568c85eea02f5b3730b22c9.png)
(1)求角的A大小;
(2)若
,
,
,
分别为
,
上的两点
,
,
,
相交于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(i)求
的值;
(ii)求证:
.
![](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/6947e5cd4568c85eea02f5b3730b22c9.png)
(1)求角的A大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73497849a8350d927c59a45604962408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6ef3d1c748bb068d95efd3917b9b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f87d0222dfe905d4f4b8108cddf2d8.png)
(ii)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4ece75fe9b8555909be5a00d2b7af0.png)
您最近一年使用:0次
名校
7 . 已知三角形
中,角A,B,C所对边分别为a,b,c,
.
(1)求证:角B为钝角;
(2)若
,
,求三角形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b094f28f5591b0932402ab8d0e93a14.png)
(1)求证:角B为钝角;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7806bf3865558f820a9bace47198fc41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c13034e0263468ba75ad1705cd57b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
解题方法
8 . 已知函数
.
(1)求函数
的单调递增区间;
(2)在
中,a,b,c分别是角A、B、C所对的边,记
的面积为S,从下面①②③中选取两个作为条件,证明另外一个成立.
①
;②
;③
.
注:若选择不同的组合分别解答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b40af7c8a04c3318d5fc0ad7d06a9a6.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3c28e2fc237e76e757b8a82c619802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da42826c1216bd581e822a807d39af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b19988d792b5252222f0a7acf7ef5fd.png)
注:若选择不同的组合分别解答,则按第一个解答计分.
您最近一年使用:0次
名校
解题方法
9 . 在
中,角A,B,C的对边分别为a,b,c,已知
.
(1)求证:
;
(2)若
的角平分线交AC于点D,且
,
,求BD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a5bab65272b0069cb5d2850f207362.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c7a6bc85c00e1cd44bf573cc461995.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a688b51f4862f610d3064199aeb336.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1c19b66cda3fb899f06d9a25e973c.png)
您最近一年使用:0次
解题方法
10 .
中,内角
、
、
的对边分别为
、
、
.
(1)若
,
,求
的值;
(2)求证:
.
![](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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce63d75a4c61c71445e11097a44c46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f41cb252b9b4ed62594da3371a5c73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6921026a422e9d91eddc311c4a5cdf.png)
您最近一年使用:0次