1 . 由沿河城市A货运到另一地点B,B离河岸最近的C处b千米,按沿河的距离算,AC的距离为a千米.如果水路运费是公路运费的
(n是大于1的实数),试说明,如何从B点修一条公路到河岸,使由A到B的总运费最小?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee6a2eba56d4f2d1670b0256b8d86b92.png)
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2 . 设
,
、
. 若
在
上的最大值为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2755fcabc5ee31d2fc498fe2c49b03f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dd3d2b2e6a989d52301fecc39eb74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a2b7c019dae83e027830b82b3ee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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3 . 当
时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c1faf7c1b8b67d224599481d8d4a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447530f99886e67b73178502c0d96238.png)
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4 . 已知函数
的值与实数
无关,过其图像上任意一点
作圆
的切线
,切点分别为
.
(1)求正整数
的值;
(2)求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996b0a944901edca9d1389bb4c3aeae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e83bff226eaa320c7a1508c8a843203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9936e82ec50dcc62a7e58966d03c311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0a415f13ef220884d1916203ed4e542.png)
(1)求正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab4717e4827480f0f6f4ded85e52eab.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bcb6c4eadda3f3c9c617ff4e876826.png)
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5 . 如果不等式
(
为常数)对
中的任何
的值恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9183358abb92458f42027a73e566af2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e11f4ca0e7ace69f92130d0525bcdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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6 . 已知
都是不等于零的常数,变量
满足不等式组
试求
的最大值 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab70189dbbb2648bdf1e9cee693d57f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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7 . 已知
,且
,这里
.
(1)当
单调且
时,求f的值域:
(2)当
为任意实数
,求此时f的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5273a3a32c14d925d5024f7e1e715531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c6fef56f0c4cc70aad1b5629e34ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f1957a83a81f5a00c4cc4656189402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bbc31ae3ce3934f677dd621f72df9b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6d45616f0387fead755616ea5b340b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4afaaca79fb6efefaabb003c19a7638.png)
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8 . 已知
;
、
.
(1)求
的最大值与最小值;
(2)求所有实数
,使得对任意三个实数
、
、
,存在一个三角形具有边长
、
、
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636631cfed262ed594a6a1023b06a480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求所有实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f484115a9df1b6060d6b14df85c6f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35770a47ffcba6bf1d94eceabb416d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee0882f5f575d9e0ae7677efbd41b38.png)
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9 . 求实数
的取值范围,使不等式
对
恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a25e5f9d79642107ad6d6f07f7070dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd0f1e3e3b41948f1b3d287c4b0cb44.png)
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