1 .
的整数部分是______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f61f4f195149d7ff7eb304649c67a8.png)
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2 . 已知a,b,c为三角形的三边.
(1)求证:
;
(2)若
,求证:
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/756084350ee839aa662bb1b39fa962db.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09cad84c1fa1dbfdc03fb5441c039a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b6d7b31981b8dc5e2ac863e5a25fda.png)
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3 . 求证:不等式
(
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ead58930c421db627156a12e71e0c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42bab065e6362b760b5eec5b969c204c.png)
您最近一年使用:0次