已知函数
.
(1)证明:
存在唯一的极值点;
(2)证明:函数
有且仅有两个异号的零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4283c448f4dc8316e98e7c75cc1dca9.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
更新时间:2021-09-05 23:31:53
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【推荐1】已知函数
,
.
(1)记
,证明
在区间
内有且仅有唯一实根;
(2)记
在
内的实根为
,
,若
在
有两不等实根
,判断
与
的大小,并给出对应的证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3b6c56aee4bb8a8131fd960415c745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663962b492c8afb35cb95ed707f7dad9.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3c2be7482719651bcf491949681e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f114df5ceabdb7e5fd3fdad4eaf056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad597ba4472ab8c270a897f85c6c04b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e22b6439923451e6de0dde5ed0b7a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e1c9c97de9198d47306216e9961b80.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450398974b1561ca801e102e16df6789.png)
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(0.15)
【推荐2】已知函数
,其中
;
(l)判断函数
是否存在极值,若存在,请判断是极大值还是极小值;若不存在,说明理由;
(2)讨论在
上函数
的零点个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a0bba7db5b38948ee3f8200e5b6e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d0588454ec8b64bf86578fb90b39e2.png)
(l)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)讨论在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e491151109a22b53131ba3203da29837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解答题-证明题
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名校
解题方法
【推荐1】(1)证明函数
在区间
上单调递增;
(2)证明函数
在(-π,0)上有且仅有一个极大值点
且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e05949c1e44ea40a7950df318b261d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afce630a612a65b24e7e0ca24eeb7a32.png)
(2)证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b944c6a4a9ef5902db0a10c8ce69af5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c39d222f7eb9ba7c9bf47a2966dc890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276d511db1eb82a29e26aa45a221336e.png)
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解答题-证明题
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解题方法
【推荐2】已知函数
,其中
是自然对数的底数.
(1)若
有三个极值点
,
(i)求实数
的范围;
(ii)求证:
;
(2)若
有三个零点
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c58cab464a4364c3eb63b21187cc5ecc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae6f2334212a5c6f8e29f1345835d67.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbcebe6adbb6abcc3706bb8b3652797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b8ec9d4206ea66a02de5c4a1e1e911.png)
(i)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(ii)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b0c4ce20f493a7edf5ca34c571560b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b8ec9d4206ea66a02de5c4a1e1e911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1310a7a80d1f8751a3f8cafe7f8c8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0874db583bdba067056872f236e372.png)
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【推荐3】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ae3a06e2db61ce958f143eb7f7390b.png)
(1)讨论函数
在其定义域内的单调性;
(2)若
对任意的
恒成立,设
,证明:
在
上存在唯一的极大值点
,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ae3a06e2db61ce958f143eb7f7390b.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab409bb25958c2f01c73e26042c6f51e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff30073e4f791a35a33a4f6fabb3bd6.png)
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