1 .
的面积是30,内角
所对边长分别为
,
.
(1)求
;
(2)若
,求
的值.
![](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/11a88bacbe94044ba51babedf92133d8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350a8ad21109ac0a2f3c814b31cf0e2f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6fe82b68a55c00b62cf384ac25d1f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2016-11-30更新
|
408次组卷
|
7卷引用:安徽省六安市霍邱县第一中学2018-2019学年高二上学期期中数学(理)试题
安徽省六安市霍邱县第一中学2018-2019学年高二上学期期中数学(理)试题(已下线)2011年广东省揭阳一中高二第一次阶段性测试题文科数学(已下线)2011-2012学年山东省潍坊市高二寒假作业(二)数学试卷云南省大理州2017-2018学年高二上学期期末考试数学理试题2010年普通高等学校招生全国统一考试(安徽卷)文科数学2017届宁夏育才中学高三上第二次月考文数试卷2.6.1.3用余弦定理、正弦定理解三角形 同步练习2020-2021学年高一下学期数学北师版(2019)必修第二册第二章
解题方法
2 . 在四边形
中,设
,
与
夹角为
,已知四边形
的面积为
.求证:四边形
的面积为
(提示:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e640241924a97363544db541bd0d604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be64d59ac6538a0f4d79fb825e082081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f90e16e18b1e88ebb1ab811d06be76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129240f7697f60be6598d76e8bc27a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5067318a571ac6db72945d76b28a1288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47adcf279108bc5ad823390e6266b7a7.png)
您最近一年使用:0次
名校
3 . 已知函数
图象上相邻两个最高点的距离为
.
(1)求
的值和函数
的对称轴方程;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2042ebe01abbcb489866791ea324daf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40238437f63cb3c9e9084bc0ffdf99e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8e9c5f353b3366a9cba9c5ad172618.png)
您最近一年使用:0次
名校
解题方法
4 . 在
中,内角
,
,
对应的边分别为
,
,
,若
,
,则
为
![](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/18af922d7bcd7a1bfbd89398d86eda5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2500d28e98b14ea3e6b6fec6c9af016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
833次组卷
|
7卷引用:2016-2017学年山东烟台栖霞市高二上期中数学试卷
名校
解题方法
5 . 已知
,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d12d5e1687ad50b954a6753ad247a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
您最近一年使用:0次
名校
6 . 在
中,
,
,且
,则
的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd536d6b4c8d17ace8bba490e07f7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
您最近一年使用:0次
2017-11-27更新
|
367次组卷
|
2卷引用:安徽省阜阳市太和中学2017-2018学年高二上学期期中考试数学(理)试题
名校
7 . 若
,且
为锐角,则
的值等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a892dbcef7934d97016bb190d94e0bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
8 . 若
都是锐角,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4253c00954682a8f04b661c515a87e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9330f5a1902fe99fc5edd744fbe9146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/015bf25507c58d6dc18117cf8516604d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6834a22cc57e6dc022c74eae7dac76.png)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
2016-12-04更新
|
714次组卷
|
2卷引用:2015-2016学年湖南省株洲市二中高二上期中数学试卷
名校
解题方法
9 . 在
中,已知三内角A,B,C成等差数列,且
.
(1)求
及角B的值;
(2)设角A,B,C所对的边分别为a,b,c,且
,求b,c的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065c64706cc4a805957318f6c6f195d6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
(2)设角A,B,C所对的边分别为a,b,c,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab839d8569171afab5ed55c22013aa72.png)
您最近一年使用:0次
2017-10-11更新
|
275次组卷
|
3卷引用:河北省邯郸市第二中学2017-2018学年高二上学期期中考试数学试题