名校
1 . 在锐角三角形
中,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe70e09edaf88e3b4d2ea3044dcb8296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/facd1fcfad659e95da18c38e5eb157b8.png)
您最近一年使用:0次
解题方法
2 . 若
,
,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c089414907a70f96147ccd88edb9b7c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5416a94cc38eae43d7353e72bc07baf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d423caea8aa4e958d661b58daab619f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8c8aa40925e20dc523827e98723c5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9fcaa804011c37873b03ee284504fe.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 已知
,
,求下列各式的值:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078714125ff27a773ded66638044f7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f331c3d96c5812a620e326373747eb.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515935ebdd37f2554fa95ddcf1accee2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0820db259ee000c27ceb00236be2d23.png)
您最近一年使用:0次