(1)用综合法证明:
,
,
均为正实数);
(2)已知:
,
,
,求证:
,
中至少有一个不小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54cfb2a3446d8011b89d87fba03a20e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d6b6b86228a9b721d618fae2963e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd86a39ae4fb080287cda63e4a68266.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/c95b6be4554f03bf496092f1acdfbb89.png)
更新时间:2018-03-04 20:50:33
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