对于区间
,
,
,
,其中
,统一将
称为这四类区间的长度.已知函数
(e为自然对数的底数).
(1)当
时,求
在区间
上的值域的区间长度;
(2)若
在区间
上单调递增,那么
时,
值域的区间的长度是否存在最小值?若存在,求出最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b85a97933a1d984f6e484b4021c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a381cebfeee07ae150cdeff6e7a64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd4d438ae7d4da0e100bb92d622c866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7204f43679af6935e494c59d40c6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eae51f0310b87cde2e206643e9d25a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64da75a02173c2a5eb40f4c68d0f4f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6e47e4a1e9492f7d5ac4e8e5be754b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/201137050b91d51437119d96c9ac2b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c1756b564bf1d998d8179637011c88.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c1756b564bf1d998d8179637011c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97ab84192e12bb292bc9fbd0b29fbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
2023·全国·模拟预测 查看更多[2]
更新时间:2022-07-09 23:01:14
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相似题推荐
解答题-问答题
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名校
【推荐1】某创业者计划在南山旅游景区附近租赁一套农房发展成特色“农家乐”,为了确定未来发展方向,此创业者对该景区附近五家“农家乐”跟踪调查了100天,这五家“农家乐”的收费标准互不相同,得到的统计数据如下表,x为收费标准(单位:元/日),t为入住天数(单位:天),以入住天数的频率作为各自的“入住率”,收费标准x与入住率y的散点图如图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/8a4035b3-8ed6-4fc3-acf4-486e47b3fb02.png?resizew=301)
(1)若从以上五家“农家乐”中随机抽取两家深入调查,记
为“入住率”超过
的农家乐的个数,求
的分布列;
(2)令
,由散点图判断
与
哪个更合适于此模型(给出判断即可,不必说明理由)?并根据你的判断结果求回归方程;(
,
的结果精确到
)
(3)根据第(2)问所求的回归方程,试估计收费标准为多少时,100天销售额Q最大?(100天销售额
入住率
收费标准x)
参考数据:
,
,
,
,
,
,
,
,
,
.
x | 100 | 150 | 200 | 300 | 450 |
y | 90 | 65 | 45 | 30 | 20 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/8a4035b3-8ed6-4fc3-acf4-486e47b3fb02.png?resizew=301)
(1)若从以上五家“农家乐”中随机抽取两家深入调查,记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5db9fa0bc36e2308bd3eecd5e78351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ff502ac689aea0659752cdfbf48bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7e82b85e060f30f81632bd4b7e3ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27478e095e24010accfc838d8421abf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0032ca31e3cba58f973c6e75b907fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc5505526d11946ca7d3a4421a9e08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
(3)根据第(2)问所求的回归方程,试估计收费标准为多少时,100天销售额Q最大?(100天销售额
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d772232f1e10b5699e1f355a57eedf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a32dc60b861e6aa4bdfcc6f594b527c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dee74594b683ef77bc5537dc77e3114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f5d1a465d96a6a494bcc1bc5aec39b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46be9c0cc5d3df556d311a2ff58fdb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39be857c20f56df4f64cecc9c689d7ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd89f5cbd05e97d644fb2e71224ecd21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899af244c416c4cd809ef1956d6367b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78753e70e7f13798476632ac3a3a4d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516a27f10d376cfbc11d649ed813f2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8fb32f3e93e9dc8b60097971d77b45.png)
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解答题-证明题
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【推荐2】已知函数
.
(1)无论a取何值,直线l都与曲线
相切,写出l的方程;(结论不要求证明)
(2)若0是函数
的极小值点,求a的取值范围;
(3)试判断在
的图象上是否存在两个不同的点关于y轴对称?如果存在,求出a的值;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db6bba37f6820571845a34b9c3e8ffe6.png)
(1)无论a取何值,直线l都与曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(2)若0是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)试判断在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解答题-应用题
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解题方法
【推荐3】如图,已知
,
两个城镇相距20公里,设
是
中点,在
的中垂线上有一高铁站
,
的距离为10公里.为方便居民出行,在线段
上任取一点
(点
与
,
不重合)建设交通枢纽,从高铁站铺设快速路到
处,再铺设快速路分别到
,
两处.因地质条件等各种因素,其中快速路
造价为3百万元/公里,快速路
造价为2百万元/公里,快速路
造价为4百万元/公里, 设
,总造价为
(单位:百万元).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/d04a39e4-0f08-44d1-aa23-0d8f7280f51f.png?resizew=231)
(1)求
关于
的函数关系式,并指出函数的定义域;
(2)求总造价
的最小值,并求出此时
的值.
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6580782a879448c42bb61dbec4206e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/d04a39e4-0f08-44d1-aa23-0d8f7280f51f.png?resizew=231)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)求总造价
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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解答题-问答题
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适中
(0.65)
【推荐1】已知函数
.
(1)当
时,求函数
的单调区间;
(2)当
时,求函数
在区间
上的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d577ba0fe9a802ce5d7b06f381ec946.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
您最近一年使用:0次
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适中
(0.65)
解题方法
【推荐2】已知函数
,
,其中
为自然对数底数.
(1)当
时,①求函数
的极值;②证明:
;
(2)是否存在正实数
,使得
的最小值是
,如果存在,求出
的值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf8c0996e28e264343e034b301e5e695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aacd52054cd0643ac61c40fc555402bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9769116ec47353514e6b7fb7b17216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b18e0e56c0546f9bab0b6114f20fcbef.png)
(2)是否存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9769116ec47353514e6b7fb7b17216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐3】已知函数
,
.
(1)当
时,求函数
在点
处的切线方程;
(2)求
在区间
上的最小值;
(3)当
时,求函数
的零点个数.(只需写出结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd5ed3dd3d97b1b9407e78c3d32c195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e61e41e8682a748e8c24b11fd1076f1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790b46a94054fee60cbc4cd9e09ed5c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
您最近一年使用:0次