解题方法
1 . 在
中,内角
对应的边分别为
,
,
,若
.
(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/24e0c10fb103930eabd5fa18e8f9bb06.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/d62842324e1f56ff8ad791e10bb9e082.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0d90d08f27d0b3410322087d0c9d68.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
您最近一年使用:0次
名校
2 . 如图1,在四边形
中,
,
,
,将
沿着
折叠,使得
(如图2),过D作
,交
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/9bc8b8dc-8ded-4e5e-8520-df06cedcb6ce.png?resizew=296)
(1)证明:
;
(2)求
;
(3)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b512c0498d251e6859686c657b5be0ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32513c66bca1e2d1706d50a6615df1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9e2a600d4675d510c58b984027e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/9bc8b8dc-8ded-4e5e-8520-df06cedcb6ce.png?resizew=296)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
您最近一年使用:0次
2024-03-07更新
|
390次组卷
|
2卷引用:江西省部分重点中学2023-2024学年高二上学期期末联考数学试题(A卷)
名校
解题方法
3 . 在
中,内角
,
都是锐角.
(1)若
,
,求
周长的取值范围;
(2)若
,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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b3a08865b7605f248db6669776c62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c256c79e8c4c18fc669412ede195d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb3739951e47c21f579ce61c210e0c3.png)
您最近一年使用:0次
名校
解题方法
4 . 在锐角三角形
中,其内角
所对的边分别为
,且满足
.
(1)求证:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/5a2264c134952d41fb9bcb90e6c72c83.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b27a9205353ce97a85d161a993a060a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2d595eac6c838f3ab8ce12c22111d0.png)
您最近一年使用:0次
2023-07-18更新
|
802次组卷
|
4卷引用:广东省广州外国语学校等三校2022-2023学年高一下学期期末联考数学试题
广东省广州外国语学校等三校2022-2023学年高一下学期期末联考数学试题(已下线)专题突破卷12 解三角形中的最值范围问题-1广东省茂名市高州中学2023-2024学年高一下学期期中考试数学试题(创新班1-3班)(已下线)高一下学期期末复习解答题压轴题二十四大题型专练(1)-举一反三系列(人教A版2019必修第二册)
解题方法
5 . 在
中,角
所对的边分别为
.且
.
(1)求证:
;
(2)若
为锐角三角形,求
的取值.
![](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/120febff288feb07b20869f74e0e7c31.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8904522bf844b61febddc24346f8232f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853322096dde564da68d75683f41d79a.png)
您最近一年使用:0次
6 . 设锐角三角形ABC的内角A、B、C所对的边分别为a、b、c,已知
.
(1)求证:B=2A;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6194c583037bd04e32fbf9b435084a9d.png)
(1)求证:B=2A;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd950ec83d93596468e3aff0bb91e0e9.png)
您最近一年使用:0次
2022-12-29更新
|
5059次组卷
|
7卷引用:广东省汕头市2023届高三上学期期末数学试题
广东省汕头市2023届高三上学期期末数学试题(已下线)专题4 三角函数与解三角形 第2讲三角恒等变换与解三角形安徽省阜阳市第四中学2023届高三下学期第一次月考数学试题第11章《解三角形》单元达标高分突破必刷卷(培优版)陕西省渭南市韩城市象山中学2022-2023学年高一下学期期中数学试题(已下线)高一下学期期中复习解答题压轴题十八大题型专练(1)-举一反三系列(人教A版2019必修第二册)(已下线)专题02 高一下期末真题精选(1)-期末考点大串讲(人教A版2019必修第二册)
解题方法
7 . a,b,c分别为△ABC的内角A,B,C的对边,已知
.
(1)若
,证明:△ABC为等腰三角形;
(2)若
,求b的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930a39b2f972dca57ce6501bd951bc8d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52cb47ee09eea138e3db92d7fcaf5e5.png)
您最近一年使用:0次
2023-02-10更新
|
733次组卷
|
4卷引用:河北省邢台市2023届高三上学期期末数学试题
河北省邢台市2023届高三上学期期末数学试题第11章《解三角形》单元达标高分突破必刷卷(基础版)(已下线)专题强化 正、余弦定理综合性问题讲与练(2)-2022-2023学年高一数学《考点·题型·技巧》精讲与精练高分突破系列(苏教版2019必修第二册)(已下线)期末专项02 解三角形-期末高分必刷题型(人教A版2019必修第二册)
解题方法
8 . 在
中,角
、
、
所对的边分别为
、
、
,
,
.
(1)证明:
.
(2)若
为锐角三角形,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/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0748fc33105be38ed525e0f2c19c5060.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44c181a2f6ae22d5d52b374768dc57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2023-01-12更新
|
1356次组卷
|
3卷引用:湖南省衡阳市2023届高三期末联考数学试题
名校
解题方法
9 . 已知
,
,
分别是
的内角
,
,
所对的边,向量
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe628882b6c69571dbd9349c5466214.png)
(1)若
,
,证明:
为锐角三角形;
(2)若
为锐角三角形,且
,求
的取值范围.
![](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/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/70f5f6989ac12dcc809e96760d094c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfe628882b6c69571dbd9349c5466214.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f95b548839a65f0abf19d15faef27a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1469989af1c27f3ac325dc0b36489747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8e95eb28a6fcd49793ffc152e2dcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6ce02259a85ea191541f4a708738f1.png)
您最近一年使用:0次
2022-11-04更新
|
586次组卷
|
3卷引用:河南省商丘市回民中学2022-2023学年高三上学期期末考试理科数学试题
解题方法
10 . 在
中,角
对应的边分别为
,已知
.
(1)若
,求
周长的最大值;
(2)若
,证明:
.
![](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/e76c583cd550570244504a1cb59160ba.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e899c486dc49e560fc4aca05e16835b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
您最近一年使用:0次