已知函数
(
).
(1)求
的单调区间;
(2)设
,
,若存在
,
,使得
成立,求实数
的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad885afd1974dc1bafb0d0afe3ef6461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfdd214549152ad47965f17aee0e2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3afa9b6f5e9873bb4aa72b6473d3f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5e1a7c79cd8e8e27091ede404a3a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2021-07-27 17:43:41
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适中
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解题方法
【推荐1】已知函数
.
(1)若函数
的单调递减区间为
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(2)若存在x使得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6e3d48cec3f5f1c2559549f1fe29d1.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461d7c9510f0cd34115560268e06da80.png)
(2)若存在x使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14013ffd2bef4828646868909824b7ee.png)
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适中
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【推荐2】已知函数
(
是自然对数的底数),
,
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(1)若
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(2)若
在
时恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9de719dcc4468ca5b923581a63a0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14983bc2592cc5572d050e364668b90.png)
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【推荐3】已知函数
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(1)若函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a83e0684f716912a6be790868891ce9.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530e5817131adf2c05b99ff18eb9060f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f8b396f2ae63e79ffd8886ae4d3849.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2679761101c85054d2eab36554354502.png)
(1)讨论函数
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适中
(0.65)
【推荐2】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c4298a188aa8f9a73d2c77fe585046.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585de67a3fc494297d375d339af6d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(3)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b8a2b58e3fb45b573845d2074d13d7.png)
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