名校
解题方法
1 . 已知函数
,
,
.
(1)求函数
的单调增区间;
(2)令
,且函数
有三个彼此不相等的零点0,m,n,其中
.
①若
,求函数
在
处的切线方程;
②若对
,
恒成立,求实数t的去取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b8ab9893507bbf1b1a7a3e8d4e8e91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2f7ccf8e26a19ae629d7ea9dfa9c16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995ec593baa4ef50b6d87c78380953d7.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826aae0515c5a5584833d2433ede1da3.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa662f0273f0921c1fa4727f632395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b954687ac9d5009ca87a2eaecda8e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f84b6b7b19cc4c7bcb4944372711d7.png)
②若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db96eed74522824b03c208595073212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78f2a451d8d6ff60c504e4123fa2484b.png)
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2020-02-29更新
|
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2 . 如图,某湿地公园的鸟瞰图是一个直角梯形,其中:
,
,
,
长1千米,
长
千米,公园内有一个形状是扇形的天然湖泊
,扇形
以
长为半径,弧
为湖岸,其余部分为滩地,B,D点是公园的进出口.公园管理方计划在进出口之间建造一条观光步行道:线段
线段
弧
,其中Q在线段
上(异于线段端点),
与弧
相切于P点(异于弧端点]根据市场行情
,
段的建造费用是每千米10万元,湖岸段弧
的建造费用是每千米
万元(步行道的宽度不计),设
为
弧度观光步行道的建造费用为
万元.
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407391716786176/2409415550607360/STEM/7c677e0a6a5a47488812d448b51a9677.png?resizew=197)
(1)求步行道的建造费用
关于
的函数关系式,并求其走义域;
(2)当
为何值时,步行道的建造费用最低?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ad9708fb35359a8c151703432df5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f332555e65843f32f4c623098c6adc72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f74fb8a56cee4af845409e85e76834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca4d64c9406e52e3ce4e35044c3ae10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6927cc2a930203ac34366383e76ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66780d058323c16b47ddcc117d8b3980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e2c17d4d575f9c14180c5648b0d6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
![](https://img.xkw.com/dksih/QBM/2020/2/26/2407391716786176/2409415550607360/STEM/7c677e0a6a5a47488812d448b51a9677.png?resizew=197)
(1)求步行道的建造费用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595044a7750ab4f84519041979c3d780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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3 . 某种圆柱形的如罐的容积为
个立方单位,当它的底面半径和高的比值为______ .时,可使得所用材料最省.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fa93a019b854f078700ffe541d40e2.png)
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4 . 若函数
与
满足:存在实数
,使得
,则称函数
为
的“友导”函数.已知函数
为函数
的“友导”函数,则
的取值范围是_________ .
![](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/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37090112aa052a7eaa19ac2e5a4809b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1f3055e2e6d3aa90d2f770019f8399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b3705bb5874ee063ae21e56895c802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 已知函数
.
(1)①若直线
与
的图象相切, 求实数
的值;
②令函数
,求函数
在区间![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fb0d24064b04be7bb11ae0e5e590de.png)
上的最大值.
(2)已知不等式
对任意的
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec3cc357c0995c416531b9ef7cdfb73e.png)
(1)①若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6767830cc1811f0f4ea5a008fdc7e723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
②令函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/075c3d1a83d2d32bf83bcd6c5148e786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0fb0d24064b04be7bb11ae0e5e590de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf8197e4f3fd18815045d29c357a863.png)
(2)已知不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466eb614ab62c1b3401c1253b5133b96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/737c165baced95d7095d9f918a9cc110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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6 . 已知
,设函数
,若关于
的不等式
在
上恒成立,则
的取值范围为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c659b61ebc9681d8b505fbf3554991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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7 . 已知函数
.
(1)讨论
的单调性;
(2)当
,
为两个不相等的正数,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84649eb8c657d880571bc751135a1f96.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2fb6ed490b826a275c183edeb58e71.png)
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8 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7050ce518174b0820bf1d183d4d985.png)
(Ⅰ)求曲线
在
处的切线方程;
(Ⅱ)当
时,求
的零点个数;
(Ⅲ)若函数
在
上是增函数,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7050ce518174b0820bf1d183d4d985.png)
(Ⅰ)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅲ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14f7498afc14e38f0b8d7bf1ce3b257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a4d023692619c0ff3e6c1f6257bac4.png)
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解题方法
9 . 已知函数
在
处的切线方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ec60c1d5e99c7dd9d343f0127bff95.png)
(1).求
的解析式;
(2).若对任意的
,均有
求实数k的范围;
(3).设
为两个正数,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f89d1045355084403aa3c3bfe812a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187c21027ff08411931d32c530b64fd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ec60c1d5e99c7dd9d343f0127bff95.png)
(1).求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2).若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147ed879fbe216a902b729fcbe96b981.png)
(3).设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8ca3aa2d1ba52e82613d0d65d800e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36af67dca04ff106d65a4a3505acb224.png)
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解题方法
10 . 某商场销售某种商品的经验表明,该商品每日销售量y(单位:千克)与销售价格x(单位:元/千克)满足关系式:
为常数,已知销售价格为5元/千克时,每日可售出商品11千克.
(1)求
的值;
(2)若该商品的成本为3元/千克,问,销售价格为多少时,利润最大,最大利润为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a510ce2b96952f6e89c50f59b97638.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4887473a8091e1ef53a169cc9f211e3a.png)
(2)若该商品的成本为3元/千克,问,销售价格为多少时,利润最大,最大利润为多少?
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