设函数
,
,其中
,
为自然对数的底数.
(1)讨论
的单调性;
(2)证明:当
时,
;
(3)若不等式
在
时恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89fbcbf5feb12cd961ee2d250f6c6a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/336a6a55e1e951490f13fc2dfc602b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17af43cc460a6a7010d51a0c9403d67.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acda6b6464db27e1ec18a1522406d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4921923069c4f38a0af1ff8637e35b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2022-09-29 15:14:28
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解答题-证明题
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【推荐1】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027f19d9f8e1dbf023c762fe2a77e279.png)
.
(1)若
,求函数
的单调增区间;
(2)若关于x的不等式
恒成立,求整数a的最小值;
(3)当
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恰有两个不同的零点
,且
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.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027f19d9f8e1dbf023c762fe2a77e279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691c0eb1f4ff34319ed487746eb004e0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097c663aef559b44ed05f4a05028ff04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c84f6625464977dac0eaea1177c1908.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7326ea56be82bd616fec7e6aa3c884c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
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【推荐2】有同学在研究指数函数
和幂函数
的图像时,发现它们在第一象限有两个交点
和
.通过进一步研究,该同学提出了如下两个猜想:请你证明或反驳该同学的猜想.
(1)函数
与函数
的图像在第一象限有且只有一个公共点;
(2)设
,
,且
,若
,则
.其中
为自然对数的底,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5511a368692de27c58ec48ce968de4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a20027d8ff971795df94a4e81f30d00.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eae1b87c23b45ce5e5e74d5b1d73234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8838adc7ebe83bcf1f22bac78c2e85.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731bdc8d2686a05f12a2ba8a7e3b01be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdc0e0ca559f0f1af6127545f356fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/633f26c3aae8c77e80ec8532b20d73a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dcd143a57a268a5a8ef486e2a4d5c0a.png)
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【推荐1】设函数
,已知
是函数
的极值点
(1)求
;
(2)当
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的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/666cf03b55cec34017d1a9281915fbac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7d4b04fdae421a5ad24c5fee042983.png)
(1)求
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(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac647e480d17831f1212291d79def43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bd061389626e3ff3457c383851f8085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐2】已知函数
(
为常数).
(1)当
时,讨论函数
的单调性;
(2)当
时,若函数
在
上单调递增,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7856bdb8bd1d35ddacaa635461a0b49.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ae17a6474ea77792676f0ec7594166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe86cace140f2c3588ab115837bbfc9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】已知函数
和函数
.
(1)若曲线
在
处的切线过点
,求实数
的值;
(2)求函数
的单调区间;
(3)若不等式
对于任意的
恒成立,求实数
的最大值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9d3040ae450e5640a72bb9d9e88e62.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
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(2)求函数
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(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf9093e67bb937df85711d3ab08fb0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐1】已知函数
.
(1)讨论
的单调性;
(2)证明:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d8943bc6210a224a424766c724f89e.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f955e2d5f73d15eee6796be1e08d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
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【推荐2】已知函数
.
(1)当
时,求
在
处的切线方程;
(2)求函数
的单调区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a5be5009643f0b8bc2c347e6ec56a8.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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【推荐3】已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792ef6097a15b8dc2f974572759f4c6.png)
(1)讨论
单调性;
(2)构造函数
若对于任意的
,
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b4bf28a8821e3b58f01ebc5ed3495a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792ef6097a15b8dc2f974572759f4c6.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)构造函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2cfad624fcafdae41f048315e5599c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e82c4003d20b36777f7aea584e3dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131fdbd527d14e5459fd25c45c613a29.png)
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