1 . (1)用分析法证明当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
(2)已知
,
,
,用反证法证明:
,
中至少有一个不小于0.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b6c5526947e9bef051bc3bdf7fd186d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b1411bbc505b5056e68e077d18e06b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d6b6b86228a9b721d618fae2963e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9b1561bc347b4255441937f5d790cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
解题方法
2 . 已知函数
.若
,
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbea50b9ee9088ba9c3b474a893fc52b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55c9f1a79c0594ee6ade90d9718aeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af4b5d261044c6f58deba8de7c0e1e35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea94f45eb564de3c17de05b6747c079b.png)
您最近一年使用:0次