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解题方法
1 . 已知
.
(1)当
时,判断函数
零点的个数;
(2)求证:
;
(3)若
在
恒成立,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98c0571cdd7a6f1fbbffedbb6a612ff.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d46ae5b08509fcb8b118c9fb5d1c929.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cd7471269ccad40e77f6edb27f957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4138f6987cd2ee9e56b2ac80e84f9e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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3卷引用:天津市第四十七中学2022届高三下学期3月线上练习二数学试题
2 . 已知实数
,函数
.
(1)(i)若函数
在
上恰有一个零点,求实数
的值;
(ⅱ)当
时,证明:对任意的
,恒有
.
(2)当
时,方程
有两个不同的实数根
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdae41a842c4b331a75219ebe04ff56.png)
(1)(i)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b29a7faa14a6e09d0db2d04f4ced03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e64ba8593537d13752713ecc882cd5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe45993e6bd636a4f34886bb3d72f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c20eaed28d5406d2448b170b8774b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec54969940d5aac61c538e14d990761f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe0bb3eb03296f12a276c5f7d96c8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b698452fda78774ad4b77594713567c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264b93aa6b21f14144bf1f77be3831e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1e760b9a9f407ab080f0367920dc50.png)
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2022-03-24更新
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2卷引用:天津市津衡高级中学2022届高三下学期4月月考数学试题
3 . 已知函数
,
为
的导函数.
(1)求曲线
在点
处的切线方程;
(2)证明
在区间
存在唯一极小值点;
(3)证明
在区间
上有且仅有两个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0a88af4b7d82b743739473cd9dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40fb8083dee4195745aae9a3f5b21b1.png)
(2)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09fee0e4f79e30bbff8e4be338f6adec.png)
(3)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf63fb25d0e7e91d886c49c7dccf1d2.png)
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4 . 已知函数
恰有两个零点,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31870835a599eaa5112fdcd646b601fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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3卷引用:天津市宝坻区大口屯高中2021-2022学年高三上学期结课考试数学试题
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5 . 已知函数
为自然对数的底数
(1)求
在
处的切线方程;
(2)当
时,
,求实数
的最大值;
(3)证明:当
时,
在
处取极小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a4b8f40d0a47d9c122bb4b511636e2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0906827be3e90e9995cddf323f21b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6aa5ec6172d70ab693efd6987d92301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
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6 . 设实数
,且
,函数
.
(1)求函数
的单调区间;
(2)若函数
有两个不同的零点
.
(i)求
的取值范围;
(ii)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0f4d8317b39e9b8c66824006aca3c5.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca579894dad67bc82cb715fd48e0d70.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(ii)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ac38fce8414bfec12b5e37e2ede8139.png)
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7 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d684030ddc21be153d22ae2b7e425.png)
为
的导函数.
(1)若
,求
的极值;
(2)若
.
(i)判断函数
在区间
上是否存在极值,若存在,请判断是极大值还是极小值;若不存在,说明理由;
(ii)求证
在区间
上只有两个零点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d684030ddc21be153d22ae2b7e425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
(i)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f00f2f6ab162f9333ec55db195d663b.png)
(ii)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e18f0bba6581812c6abe566a2e60b0a.png)
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8 . 已知函数
.
(1)讨论
的单调性;
(2)若
在
上有零点
,
①求a的取值范围;
②求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbe80b8a8c41618fee1ff5b0d184b1.png)
(1)讨论
![](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/e5d6243e93c41978871cb23d8e66148d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
①求a的取值范围;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c7443a695dd964403459b6135811e3.png)
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9 . 已知函数
,若函数
的图象与
轴的交点个数不少于
个,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921247c4d53faa77a74fa35cc513964d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6103d76a1b29dbb1a32759b32c23089.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2022高三·全国·专题练习
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10 . 已知函数
,
,
,
.
(1)若直线
与
的图象相切,求实数
的值;
(2)设
,讨论曲线
与曲线
公共点的个数.
(3)设
,比较
与
的大小,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909e6a71cfe4d76603356a31238613ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f1a3feca6218955446108ebad0a524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f282abe4090a28c49ce588d936f6304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a743eba260bbd19d24ac32254cf5e3b.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0e3a6b2eca49b26afa362ea74c053d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd330acca8e17f5ff9aca1f0f312df50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d9c89d2cd1fb46b1e71ad10227c098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7028a5fa4d781d382ca3b73b74796e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8968a4fde3cdbb6b8a177e87b91542bf.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d39f63380f7f1b57b2441522692678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b28ff2fc93e107ec4c657665bb9a88f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2156c21967429e3cdf1ca50625d9e6af.png)
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天津市河西区2022届高三下学期总复习质量调查(二)数学试题天津市河西区2022届高三下学期二模数学试题天津市第四中学2023届高三上学期期中模拟数学试题(已下线)第13讲 双变量问题-2022年新高考数学二轮专题突破精练(已下线)专题10 利用导数解决双变量问题-2022届高考数学一模试题分类汇编(新高考卷)(已下线)专题11 导数及其应用难点突破3-利用导数解决双变量问题-2