已知函数
,其中
.
(Ⅰ)若
,求函数
的极值;
(Ⅱ)设
.若
在
上恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41033c3f16819149c911528526e11c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92634a7daabf9bce925f0d7507ea7526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e923547f733061e733d6ecb0fac6c8c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79fe3414b32bbd1190b41ed8307f905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-04-09 13:27:54
|
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解答题-问答题
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较难
(0.4)
解题方法
【推荐1】已知函数
和函数
.
(1)求函数
的极小值;
(2)讨论函数
的极值点的个数,并说明理由;
(3)是否存在正实数
使函数
的极值为
,若存在求出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc68c31be0ba07c12c812326c0657558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3748b5adc5012c7920629c359377a0cb.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(3)是否存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6322308be685c4a21efa285279afa9e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】已知
有极小值.
(1)试判断
的符号,求
的极小值;
(2)设
的极小值为
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11a1c3324909b8b89036683bba759b.png)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae632386b3547615cb0e85b0cc708cc.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
解题方法
【推荐1】已知函数.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20912d806a0645fe5b4b98911e2fac53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00892abf38c184efc68af37b7d96f60a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e93ec2a96d2ee6e7a91094f7cba319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
解题方法
【推荐2】设函数
,
表示
的导函数.
(1)求函数
的单调递增区间;
(2)当
为偶数时,若函数
的图象恒在函数
的上方,求实数
的取值范围;
(3)当
为奇数时,设
,数列
的前
项和为
,证明不等式
对一切正整数
均成立,并比较
与
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d65cc2223ad9962d34105f2a75b756a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80063d45a0c9dc6f8c56eba86b23a39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe96ccf7d78566dead981aa9bf85ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0993a7e1439a5dc308c32cbb1b89147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e835940e4b23dacc4a121b392636da3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e27168f68700b73325dd152757791d30.png)
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解答题-问答题
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较难
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【推荐3】(1)讨论
的单调性;
(2)记
,试探究是否存在
使
在
处取得极小值且
恒成立,若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e21d4653eadd671d369ac8c746ad42.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b29e05819d8756c101838746708acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11abb76da45ffa52b47c3a6b9a03ac7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85187c85826beeca12137805293fff77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次