解题方法
1 . 已知
、
为方程
的两根,求
的最小值.
![](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/466fdf55433b08573a053083edb7bb35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7c2af390b1667150182cb9eea8fe3e.png)
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2 .
的边分别为a,b,c,且满足
,则
的取值范围为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399461908ddad512b53d04d80f4ca580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c51967992d093c51c7d28c46e3840a95.png)
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名校
解题方法
3 . 已知函数
,若存在非零实数
使得
,则
的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ba7eda6b3e8f83f097f405f995c0ba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0ae78240249772a407fc55a9f2a542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f164e2348de7d9967b1832004db124.png)
您最近一年使用:0次