已知函数
.
(1)证明:当
时,关于x的不等式
恒成立.
(2)若正实数
,
满足
,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f06495bda4617340d809fb64cc300fe.png)
(1)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/655b06387179d53c1e474fcfcb408b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1508082ea7ec2789975f58e3c4b15451.png)
(2)若正实数
![](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/15664cfc89712268f585279990b2e953.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6330de640d51bb3970813289a4de3a5d.png)
更新时间:2022-01-29 13:32:20
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【推荐1】刻画曲线的弯曲程度是几何研究的重要内容,曲线的曲率是针对曲线上某个点的切线方向角对弧长的转动率,曲线的曲率越大,表示曲线的弯曲程度越大.若记
,则函数
在点
处的曲率
.
(1)求曲线
在点
处的曲率;
(2)已知函数
,
,若存在
,
使得
的曲率为0,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7098756492427ac801e06dbe740ce803.png)
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(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9cd9f72278fcaaa0f5a07e0697a8f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f23c2a2d94f012302d6c743f7a8f8b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028517e8bebe634441e0a5c79828e88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2f3f1de05d38700456f22d147f2ec5.png)
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【推荐2】已知函数
,讨论函数
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【推荐1】已知函数
,
.
(1)若
与
在定义域上有相同的单调性,求
的取值范围;
(2)当
时,记
,
的零点分别为
,判断
与
的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011f70aeecfb83d59ed7ad004c1be0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2110cc9e75b83f6066f95c669079fc98.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
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【推荐2】已知函数
.
(1)若
,求不等式
的解集;
(2)当
时,求证函数
在
上存在极值点
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bb7e14f41c4ad00b1556a724367fb4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48ca08796cbef935ad39914c0b45a8a.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐1】已知函数
,直线
.
(1)若直线
与曲线
有且仅有一个公共点,求公共点横坐标的值;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0a027118f5e36a7cec1d7b2a11cca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf6f516f2a4de31057d9c492f17e0b7.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若
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【推荐2】已知函数
.
(1)求证:
恒成立;
(2)若函数
有两个不同零点
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7ed99a74e126a05cb520f19c094020.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ca6e42298d3605bee78a4107299c76.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b36efac8085941d00a4661b6edbe15a.png)
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【推荐3】牛顿在《流数法》一书中,给出了代数方程的一种数值解法——牛顿法.具体做法如下:如图,设r是
的根,首先选取
作为r的初始近似值,若
在点
处的切线与
轴相交于点
,称
是r的一次近似值;用
替代
重复上面的过程,得到
,称
是r的二次近似值;一直重复,可得到一列数:
.在一定精确度下,用四舍五入法取值,当
近似值相等时,该值即作为函数
的一个零点
.
,当
时,求方程
的二次近似值(保留到小数点后两位);
(2)牛顿法中蕴含了“以直代曲”的数学思想,直线常常取为曲线的切线或割线,求函数
在点
处的切线,并证明:
;
(3)若
,若关于
的方程
的两个根分别为
,证明:
.
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(2)牛顿法中蕴含了“以直代曲”的数学思想,直线常常取为曲线的切线或割线,求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfce215a0f2e0c00249cda12ac2b065.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c417b0bdd2f26b54c74c52cb763572.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11821d923a6bec96212e1cedde4244ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93a9dc63ab7eb56073cdb154e414941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dae74c724114bfeff024dd7b79f5edc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fd88f71f4c51c9a8249d8434258729.png)
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【推荐1】已知函数
.
(1)若
恒成立,求
的取值范围;
(2)当
时,设函数
,若对任意
,存在
,使得
成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33df9ff40c1f537af95bf2b23b3b91e2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb09d22756ead537531baa8f7465656b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e94b687c2021e1bfc33e8fefeaddb64.png)
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【推荐2】已知函数
(
,
为自然对数的底数),
是
的导函数.
(1)当
时,求证
;
(2)
,是否存在负整数
,使得
对一切
恒成立?若存在,求出
的最大值;若不存在,说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87f1fcf1d585e09af74e70a6bac1e7c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f27a4fb9e60dfcfe8216d095aa98d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11d9d8c6de05288b6089032c2b98486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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