设函数
.若
,可以证明:函数
在
上为单调递增函数(本题作为已知条件).
(1)讨论函数
的单调性;
(2)当
时,求证:
在区间
上有唯一的零点;
(3)记(2)中的零点为
,求证:
,
,…,
,…为递减数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128272b0b392ade721c85c700236b591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ff2aa68223dfc02f39d7d10fa005387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25af07543fffc6f28dc7967fb9b27381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ac89f0f8b0ec92d630bfd51539a4cf.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b16163b2dd9b75170fe9ca806ba393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a2ad434fb070b1189922354934502a.png)
(3)记(2)中的零点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9999bcd56d5a28f4d4094a8b6c8842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9999bcd56d5a28f4d4094a8b6c8842.png)
更新时间:2021-01-09 16:29:10
|
【知识点】 用导数判断或证明已知函数的单调性
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名校
【推荐1】已知函数
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【推荐2】已知函数
(其中
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(1)当
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,求证:
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(1)当
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(2)在(1)的条件下,记这些零点分别为
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【推荐3】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
(1)求曲线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187c21027ff08411931d32c530b64fd3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44df74daa535c0c7f1d66f371b276c6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11abb76da45ffa52b47c3a6b9a03ac7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432706cd87d4d99965ea574910e21ecd.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c28b9a18362e5ede2d6f53643f265ba.png)
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