设函数
,
.
(1)若
是
的极值点,求a的值,并讨论
的单调性.
(2)已知函数
,若
在区间
内有零点,求a的取值范围.
(3)设
有两个极值点
,
,试讨论过两点
,
的直线能否过点
,若能,求a的值;若不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238ef0a4a6c7fc61fa9115902d93a1dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c6959bdfc9cb76091be6cf5b1d02f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
(3)设
![](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/d27c0ab3e2d7698f082854bafe4174dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc47735cc385a3474bc1dabad322304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
2024高三·全国·专题练习 查看更多[1]
(已下线)专题4 导数中的隐零点问题【讲】
更新时间:2024-05-25 22:17:21
|
相似题推荐
解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知函数
,
.
(Ⅰ)若
是
的极值点,求
的单调区间;
(Ⅱ)若
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aaeabb8d6db336c51c6a53c0e7870c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d469c9b3f344fab5cad1f898602468.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa18838a13fda4e45612c32cdf98b71.png)
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(0.4)
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【推荐2】已知函数
,
是自然对数的底数.
(1)当
时,求
的单调区间;
(2)若存在
使得
,试求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b36a2b3ce7c0fe875a0f50bcdad72c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37d85a6b36808cdfe077eddca23d8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da3f440c24f995eeaaa9a59bfdd92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab0d94101ed1c76b6d05ac467e24a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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较难
(0.4)
【推荐1】已知函数
.
(1)当
时,求曲线
在点
处的切线方程;
(2)当
时,判断方程
的实根个数,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495685b455ef06c69a26907e54ac2f08.png)
(1)当
![](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/bd4ec6c78bab05a5df3d9954a70846ec.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fdce0cfb1ec0ad7add92a24a5ae07b.png)
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【推荐2】设函数
(
),
.
(1)若曲线
与
在它们的交点
处有相同的切线,求实数
,
的值;
(2)当
时,若函数
在区间
内恰有两个零点,求实数
的取值范围;
(3)当
,
时,求函数
在区间
上的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3faf9e923599c714038345503bc8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de3b8616b18e1772e20cb0557125f1f.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42007bf969626b5b86abe80782c6879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3524a611d4818f61abb210d6c598cd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7863b54185da5a3f1a765e1aa0577e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd243fab0af865af67a2ab817e909cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d765aa701aea8b0a18496fad1449a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4df6e039064c9b8963d3c62150df8e6.png)
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较难
(0.4)
【推荐1】已知函数
,
为
的导数.
(1)讨论
的单调性;
(2)若直线
与曲线
有两个交点,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dfbebe96106abe60a93fa0a23ad3e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dda4598844569383d250597693d129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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(0.4)
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【推荐2】设函数
,其中
.
(Ⅰ)当
时,求函数
的极值;
(Ⅱ)当
时,证明:函数
不可能存在两个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03173cac7ae753ff74277ad2e5c3c2c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5f421939ee855f25927e7570d82c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dc56a349930f604e748c531922c4c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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解题方法
【推荐1】已知定义在R上的函数
,其中a为常数.
(I)若x=1是函数
的一个极值点,求a的值
(II)若函数
在区间(-1,0)上是增函数,求a的取值范围
(III)若函数
,在x=0处取得最大值,求正数 a的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6225852d10eb14efaac1c4e25190005b.png)
(I)若x=1是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(II)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(III)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5172890a6cd4374715acac7defa315.png)
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【推荐2】已知函数
的导函数为
.
(1)当
且
时,求
的最小值;
(2)当
且
时,若
存在两个极值点,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a32aea346abc4d63e1f1e59d11f89ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724340d69477c0ec2418c392b22b1cab.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次