已知函数
,
.
(1)
时求函数
的单调区间;
(2)当
时,求证:对任意
,恒有
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899d40b293c6e4d460165858d72c19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72eee485cec19381b84ff43f236dcfb8.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e189dbc979fad6bf8ca03ac1388cbac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966b60302d80d8613675bb3dd5c03164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038f0764661f4ef2172911da4884232e.png)
更新时间:2021-03-31 19:38:08
|
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解答题-证明题
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(0.4)
【推荐1】已知函数
.
(1)求函数
的单调区间和最小值;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f051b579e8f5513893624ca149dba098.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ffd8b9b441ccc043d7914fab9a64936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1e8206277f2bd85e7fc5b84c421156.png)
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名校
【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f53f81bca037a4383c1fab122a3cd3d.png)
(1)判断函数
的单调性,并比较
与
;
(2)设方程
的两个根为
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f53f81bca037a4383c1fab122a3cd3d.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b842c8f63970a0cd302017ae1eef5720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2748b5620b52169c5cf05c8df92f7340.png)
(2)设方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341058ba41688b6c7253c4ca2cad0cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39a533560863efecd642f0476fe8a38.png)
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解题方法
【推荐1】已知
,
,
,其中e是自然对数的底数,
.
(1)讨论当a=1时,函数
的单调性和极值;
(2)求证:在(1)的条件下
;
(3)是否存在正实数a,使
的最小值是3?若存在,求出a的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d0ff7ac083b888d0055e49bf130a6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3980c52927f12c114f3b291ad714d778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc6deca979f50c3310464cca848768a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f7f23e7f20dd8bc65a4967cd306782.png)
(1)讨论当a=1时,函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求证:在(1)的条件下
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf67014ab217c6cacd76dc4b19774d8.png)
(3)是否存在正实数a,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐2】已知函数
.
(1)证明:当
时,
;
(2)若函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2324a4afd1b3cd2fff4e4c7a280ef1f.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aef9a3fb3ff7cfa9f59a4d55dafdc5.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】已知函数
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(1)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b507d22b6695ca9cb4b80e918a03784.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a6d60f09509c83da871b7e4f495016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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