已知函数
.
(1)求函数
的单调区间;
(2)设
,若
的极小值为
,证明:当
时,
.(其中
…为自然对数的底数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ac85e52735141075c245f36ed72547.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1109e88ce4289cacd83e9341cd16984a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e03ffb83e59877e45e03d25a3fabe41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05fce924911d5ed93147dfce9e41c2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07d7af2ede4abfa4d647b4058992d00.png)
更新时间:2020-02-18 06:21:21
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相似题推荐
解答题-问答题
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适中
(0.65)
名校
【推荐1】已知
.
(1)若
,求曲线
在点
处的切线方程;
(2)若
时,求函数
的单调区间;
(3)若不等式
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7404c842a5ac9e09cc489d4dc8480f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d06e33d079ac1649ee5eea8f61de7cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed119967c899453876d6dda9f466bbcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
【推荐2】在平面直角坐标系
中,已知椭圆
:
与椭圆
:
,且椭圆
过椭圆
的焦点.过点
且不与坐标轴平行或重合的直线
与椭圆
交于
,
两点,与椭圆
交于
,
两点.
(1)求椭圆
的标准方程;
(2)若存在直线
,使得
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77bb900f8c975bf487cd57319d488938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f642cc82f9cb94f68265b4ec78f8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2d466e7019fc215699264d18069b87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)若存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b29fa3fdb0b5df281c8a847c662b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐3】定义在
上的函数
满足
,
,求关于
的不等式
的解集.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c3f294ce7656a0812a0e93fa204f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86c5126d03e674d5e7ca7652c332ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59157faa2aff179f7d5183f25b420c14.png)
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【推荐1】已知函数f(x)=
,其中a>0.
(1)当a=1时,求f(x)的单调增区间;
(2)若曲线y=f(x)在点
处的切线与y轴的交点为(0,b),求b+
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3549ea047a41b8d8220bdee0d8e7ca.png)
(1)当a=1时,求f(x)的单调增区间;
(2)若曲线y=f(x)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ead6dfd571b4aa38eb9b8b452f6fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
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【推荐2】已知函数
.
(Ⅰ)当
时,求曲线
的在点
处的切线方程;
(Ⅱ)求函数
的单调区间;
(Ⅲ)若
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793fa34ae500da89f277159760840288.png)
(Ⅰ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(Ⅱ)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babc2bdb59e9ae1821bd48e7395474d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
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适中
(0.65)
【推荐3】某中学学生会为了让新高一的同学更好的了解学校的各种社团活动,计划设计一张形状为矩形的宣传海报来介绍各社团活动.如图,该海报设计上、中、下三个全等的矩形栏目,三矩形栏目面积总和为60000
,四周空白部分的宽度均为10
,栏目之间中缝宽度为5
.
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762775813431296/2777715946332160/STEM/76bad4a303d74df0aafa748d7a127fd0.png?resizew=143)
(1)要使整个宣传海报的用纸面积S最小,应该怎样设计每个矩形栏目的长度x(单位:
)和高度y(单位:
),并求出S的最小值;
(2)若学校宣传栏只剩下一块长度为180
,高度为780
的矩形区域可用于张贴宣传海报,为使整个宣传海报的用纸面积S最小,又该如何设计每个矩形栏目的长度
(单位:
)和高度y(单位:
),并求出S的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/12/2762775813431296/2777715946332160/STEM/76bad4a303d74df0aafa748d7a127fd0.png?resizew=143)
(1)要使整个宣传海报的用纸面积S最小,应该怎样设计每个矩形栏目的长度x(单位:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)若学校宣传栏只剩下一块长度为180
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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适中
(0.65)
【推荐1】已知函数
.
(1)求
的单调区间;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006569eaf8c38ce3b17cc89d315c0fa8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708b0553fbc852f68c541cded2e92cbd.png)
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解答题-证明题
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适中
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【推荐2】已知函数
.
(1)求函数
在
处的切线方程;
(2)当
时,
,求实数
的取值范围.
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef65e102fffc54d1e3fa0a30a78859a.png)
(1)求函数
![](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/2c77f150cdda10a586d2e33af181f9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01bf2e2826bf07a6659132806f18b2f.png)
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