已知函数
,
.
(1)求函数
的零点个数;
(2)证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90e8926b8772f1ccd5d9dc2b5981f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e82c4003d20b36777f7aea584e3dd4.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3583be0eabe632c6610e13c6f3409ce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1222b7b74017f4a004f999f1ceb664.png)
更新时间:2022-12-22 10:16:59
|
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解答题-问答题
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困难
(0.15)
【推荐1】已知函数
,其中
为自然对数的底数.(参考数据:
)
(1)讨论函数
的单调性;
(2)若
时,函数
有三个零点,分别记为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b887b25f5ad2d980e045d2291257fe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed6e3d7aa8473642627a2f3c76a5828.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d241da935386f3e8bc0406fd72e8b63b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8904ffa24f7cbc884c166910750386b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657b70f5f2a04144210f27786528d276.png)
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解答题-证明题
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困难
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名校
【推荐2】已知函数
,其中
.
(1)求证:当
时,
无极值点;
(2)若函数
,是否存在
,使得
在
处取得极小值?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eccb36f211dc7e379b01ce19a447781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93858df8b2812afc55316bfa8028f837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb01b633c2b93682bcdf7ec1f4ce8347.png)
![](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/bb45f673c56a289ea78831c9237e8d20.png)
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解答题-证明题
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名校
【推荐3】已知函数
.
(1)讨论
的单调性;
(2)设
,
分别为
的极大值点和极小值点,记
,
.
(ⅰ)证明:直线AB与曲线
交于另一点C;
(ⅱ)在(i)的条件下,判断是否存在常数
,使得
.若存在,求n;若不存在,说明理由.
附:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ef3e79110067a46276f0869bea25af5.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](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/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45dddee525114c09ee0d1205aed6e7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3b54e0dcdc081d45fb3df933cddc29.png)
(ⅰ)证明:直线AB与曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(ⅱ)在(i)的条件下,判断是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06318573bd8cf7f9b3ff443b31803df5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397471107e2d3a5ccedda940a29a361a.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac45788afe168a32cfc51ad8e1429577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b4427f76042503d0ba2302a55fe33d.png)
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困难
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名校
【推荐1】已知函数
,
.
(1)若
,求曲线
在点
处的切线方程;
(2)设
,若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd44e7325fd9504755482dafcd8478ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6b6a11760d0724b0b60e55970e229.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40fc63b39f3a0e7b7f99c38753846e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0879734ee766cb630cfeb3f25fea7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】设函数
.
(1)求
的单调区间;
(2)设
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有两个极值点
,其中
,求
的最小值;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9ea9b01cf309d9e0e8f16ab420d861d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1231b782ab5fdf1ee47116071194116f.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/a8e11d0044f79bff62030ef2041ca0f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008735117b891a40954cbc319bd770bb.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070923b1acaf3e2fa126d851085a26cf.png)
您最近一年使用:0次
解答题-证明题
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困难
(0.15)
名校
解题方法
【推荐1】设函数
.
(1)当
时,求
的单调区间;
(2)当
时,
恒成立,求
的取值范围;
(3)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d452de0c661afbb8a60361c66da5b372.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1e281f89f17d958553664afd958bb3.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
解题方法
【推荐2】已知函数
,
.
(1)当
时,求函数
的极值;
(2)若
,证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456993afb645776a384e47d45c59a91b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/616e29c9a401d7fd9092c8a69d5f20cc.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c944c1c2791f64d1f371d43e9a419983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a5abc09115d98a158affd1a307e15f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047056c99b39c70fa40d3c8178e5b631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46810b49fe55d60aaf8dd596f7cec20f.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】已知函数
,
.
(1)当
时,讨论
的单调性;
(2)若
有三个不同的零点
,
,
,求a的取值范围,并证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fef211e5f110fe567b60ee628d6023f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6442958bd5b5f8ac690b33ea0bccdd0f.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c547c64dc542c2d192a6ece476fc9bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f0370bcf7c4e9b3151cd3c779b2d4.png)
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解答题-问答题
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困难
(0.15)
【推荐2】已知函数
.
(1)若函数
和
的图象都与平行于
轴的同一条直线相切,求
的值;
(2)若函数
有两个零点
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cec2fa9c3c42a838262fda070e2d7ac5.png)
(1)若函数
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4633de9335d15d7685bdecb007a3678c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5534757bb68a5fef77c2c52f4eed8f6.png)
您最近一年使用:0次