1 . 已知函数
.
(1)若
有两个不同的极值点
,
,求实数
的取值范围;
(2)在(1)的条件下,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c4c965c5bbfad90aabbf9d2db40066.png)
(1)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/0a6936d370d6a238a608ca56f87198de.png)
(2)在(1)的条件下,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba33f1be4a5f51d7abdc5185392d79a2.png)
您最近一年使用:0次
2020-04-06更新
|
1294次组卷
|
8卷引用:辽宁省沈阳市五校协作体2022-2023学年高二下学期期末联考数学试题
解题方法
2 . 设函数
,其中实数
.
(1)当
时,求
的极大值;
(2)若函数
在
上有零点,求
的取值范围;
(3)设函数
,证明:当
时,对于
都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb9fe43a6a4a745c1f8799c6daebda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1699f7e03557f35fc89288c23c0c559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ba299799a2a3ea4187a0f387f007d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4af91eb751530b164c0cc095d30210ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16bbf81ee0855abdceddc1364f22afd.png)
您最近一年使用:0次
2020-08-03更新
|
380次组卷
|
2卷引用:辽宁省葫芦岛市2019-2020学年高二(下)期末数学试题
解题方法
3 . 已知函数
.
(Ⅰ)若函数
在
上是减函数,求实数
的取值范围;
(Ⅱ)当
时,求证:对任意
,函数
的图象均在
轴上方.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe10d93fcec2543fb3f0cd0509ffd7b.png)
(Ⅰ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c1756b564bf1d998d8179637011c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539ed85a90ec295155431c5c5b2b0efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
2020-04-04更新
|
625次组卷
|
3卷引用:辽宁省沈阳市郊联体2019-2020学年高二下学期期末考试数学试题
名校
4 . 已知
,函数
.
(1)讨论函数
的单调性;
(2)若
,且
在
时有极大值点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30da47b10ffded2c6cabc7fce14ce93.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/6ef7ded99afff9cc6f8ccd994ac0e22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7752d97558795e1904cdb31f60865ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b962bb3cf61d0fd2bc73a08765012926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a1141e168d61e03ef28b799ed35fc4.png)
您最近一年使用:0次
2020-03-19更新
|
526次组卷
|
3卷引用:辽宁省东北育才、实验中学、大连八中、鞍山一中等2018-2019学年高二下学期期末联考数学(理)试题
5 . 已知函数
.
(1)讨论函数
的单调性;
(2)证明:在
上存在唯一的
,使得曲线
在
处的切线
也是曲线
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e96484d9c6182b671045224c2c1db2.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
(2)证明:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d0888a8522bff9d4ad2edabd5bd0c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11abb76da45ffa52b47c3a6b9a03ac7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2eff609c6043c2a89a6dd163fe2244.png)
您最近一年使用:0次
名校
6 . 已知
,其中常数
.
(1)若
恒成立,求实数
的取值范围;
(2)若函数
有两个零点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ce64b31f7aa2871b9d47c952ba9917.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2aabc96b7433bba077ceac76d8f0d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729873a7dabcd4143318e644ff020b76.png)
您最近一年使用:0次
2020-02-06更新
|
528次组卷
|
2卷引用:2020届辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校高三上学期期末数学(理)试题
7 . 已知函数
.
(1)试判断函数
的单调性;
(2)若函数
在
上有且仅有一个零点,
①求证:此零点是
的极值点;
②求证:
.
(本题可能会用到的数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc873fc03e6e4d3c4ba02f8b1147b20.png)
(1)试判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066545d533a4f683794e311d3ccf4f0a.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38bd8d7a840f2d96f45406c9fb843dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
①求证:此零点是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf3a0e4fd597d2bb0c25070aa45f049.png)
(本题可能会用到的数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acf9e90fc3581e8698100d30706c3e6.png)
您最近一年使用:0次
解题方法
8 . 已知
,函数
.
(1)
是函数数
的导函数,记
,若
在区间
上为单调函数,求实数a的取值范围;
(2)设实数
,求证:对任意实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
,总有
成立.
附:简单复合函数求导法则为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d9d4064a54ac23003bfaf1a1e25d71.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585de67a3fc494297d375d339af6d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13e38a5ee18ecf4af2d9a8443b4a7bc.png)
(2)设实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e1b2fc3d27f0953c953a4cbad2c199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60025fe6bbfd7645844c9e3e7a5871e6.png)
附:简单复合函数求导法则为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691ffde938b490b959ae923b1169488b.png)
您最近一年使用:0次
2020-02-06更新
|
1085次组卷
|
3卷引用:2020届辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校高三上学期期末数学(文)试题
2020届辽宁省实验中学、大连八中、大连二十四中、鞍山一中、东北育才学校高三上学期期末数学(文)试题(已下线)专题04 巧妙构造函数,应用导数证明不等式问题(第一篇)-2020高考数学压轴题命题区间探究与突破人教A版(2019) 选择性必修第二册 过关斩将 第五章 一元函数的导数及其应用 5.3 导数在研究函数中的应用 5.3.1 函数的单调性
9 . 已知函数
.
(I)试判断函数
的单调性;
(Ⅱ)若函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400480e332e8eaf6ddc7cb1d413c3bed.png)
在
上有且仅有一个零点,
(i)求证:此零点是
的极值点;
(ⅱ)求证:
.
(本题可能会用到的数据:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c4817ccb65d265cee8d06c70eac4d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10edca5c73db8439aec3b442eb22a1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7be8af850e9e612feefd2a50d86af2f.png)
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
(I)试判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70ee19e659f32d780fc68d4200c081b.png)
(Ⅱ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400480e332e8eaf6ddc7cb1d413c3bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf8197e4f3fd18815045d29c357a863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8938db94f49dcbe0c383fba0241bb0da.png)
(i)求证:此零点是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9f263902128230501017bb0598a6ae.png)
(本题可能会用到的数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c4817ccb65d265cee8d06c70eac4d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10edca5c73db8439aec3b442eb22a1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7be8af850e9e612feefd2a50d86af2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50101047632b94dcd5cf8035b093cc5.png)
您最近一年使用:0次
10 . 已知函数f(x)=ex﹣ax
(1)讨论函数f(x)的单调性;
(2)若存在x1<x2,且满足f(x1)=(x2).证明
;
(3)证明:
(n∈N).
(1)讨论函数f(x)的单调性;
(2)若存在x1<x2,且满足f(x1)=(x2).证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c158a550aaa60c8a2282649dae147e1d.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e183542bf17afcda7bd178e0fa215221.png)
您最近一年使用:0次