1 . 已知
的三边长
,三内角为
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b102b36cba4c1868afcd7a591a796da.png)
您最近一年使用:0次
2 . (1)已知
,求证
;
(2)已知
,求证
中至少有一个大于1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aeba3d801bcfbc2b82b82f6972cd487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a85ae237b135b9d58a42e445040eecf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9363e9ea1297f1346032919f87ce6a39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
您最近一年使用:0次
2020-04-16更新
|
380次组卷
|
2卷引用:河南省开封市兰考县等五县2018-2019学年高二下学期期中联考数学(理)试题