名校
解题方法
1 .
的内角
、
、
所对的边分别为
、
、
.
(1)若
、
、
成等差数列,证明:
;
(2)若
、
、
成等比数列,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1ef69432777e05e7c423ce9ffca7e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c12b6925aa6e4e44d1514b2fd5030e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b96f07aca9b63c31ffd5273e302635f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cd0299f2b7ce18b32f69018b413fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a594d6d1ee2ac71f4e71fd4586c2b18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f23a659d6bd559131d5a9c0e993696.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cd0299f2b7ce18b32f69018b413fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a594d6d1ee2ac71f4e71fd4586c2b18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f23a659d6bd559131d5a9c0e993696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b632cf18caa86fc000e4b62b467e3e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cd0299f2b7ce18b32f69018b413fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a594d6d1ee2ac71f4e71fd4586c2b18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f23a659d6bd559131d5a9c0e993696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
您最近一年使用:0次
2 . 若
,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f40c24c64bbb0645fcf585f4e66872.png)
A.2 | B.4 | C.6 | D.8 |
您最近一年使用:0次
2017-02-08更新
|
444次组卷
|
3卷引用:2016-2017学年西藏山南地区二高中高二文上期中数学试卷