名校
解题方法
1 . 在平面直角坐标系
中,函数
的图象过点
,且在点P处的切线
恰好与直线
垂直.
(1)求函数
的最大值;
(2)若正数
,
,
满足
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7455cd7a24b4985e0779efc79b5d11bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62648bbd5919a180a059169c3fea98e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676b05d4baad4148c4fb3b052f32d065.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b85cbf4d2253bd4077cfb4886751e0.png)
(2)若正数
![](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/2193edd12ed74d977e2edb6f3c7f3058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/972a76452271b2bb0ec10a450a86607f.png)
您最近一年使用:0次
2021-05-28更新
|
218次组卷
|
3卷引用:西南名校联盟2021届高三下学期4月高考适应性考试数学(理)试题
20-21高一·江苏·课后作业
2 . 甲、乙两同学分别解“设
,求函数
的最小值”的过程如下:
甲:
,又
,所以
.
从而
,即y的最小值是
.
乙:因为
在区间
上的图象随着x增大而逐渐上升,即y随x增大而增大,所以y的最小值是
.
试判断谁错,错在何处?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4318a47d7e83d587e74bab4d3d1f6883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2751c5819303b8e60add2356bd7c808b.png)
甲:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7833f1728bed812cd05321fdae104d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fb40a36a293471742ce75f6b9635b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca195cc5a87ca48a861db1d86f5dbf33.png)
从而
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35510c7852e4f698522f808de475984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
乙:因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2751c5819303b8e60add2356bd7c808b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209a95bdee4d5e56dd0e165d3e794d18.png)
试判断谁错,错在何处?
您最近一年使用:0次
20-21高一·江苏·课后作业
3 . 计算下列两个数的算术平均数与几何平均数(其中
):
(1)2,8;
(2)3,12;
(3)p,
;
(4)2,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5abd313d4e92a762fb7fb0c1cb65263d.png)
(1)2,8;
(2)3,12;
(3)p,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d588b8333c14c140bc7617f7abafc3.png)
(4)2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a80b9f2e6c688236d68b3fc93ae65af8.png)
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解题方法
4 . (1)设x,y为正数,
,证明
;
(2)x,
,
,求证:对于任意正整数n,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b344a55415f511aa8f43d47684bb050f.png)
(2)x,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7534520ae43c10f7b1b48168ee527315.png)
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5 . 如图,边长为1的正方形ABCD内有一个内接四边形EFGH.求证:四边形EFGH至少有一条边不小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://img.xkw.com/dksih/QBM/2021/12/1/2863153997955072/2865037740638208/STEM/63e6e3645f9c4389b41628cb67b77893.png?resizew=238)
您最近一年使用:0次