1 . 中国文化之美照亮生活,宋代的几何图案(图1)注重理性和逻辑的文化风气,中式美学的另一种浪漫,蕴含着数学对称之美.几何图案由函数,
,
与函数
(
)图像(如图2)分别关于
轴、
轴及原点
对称所得(如图3).
(1)若图3构成正八边形
,求实数m的值;
(2)若关于
的方程
有两个不相等实数根
,
.
①求实数m的取值范围;
②求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df28f28107cb72571abc94291e2c05d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66692ec49a458f9e48c7315d03dfc37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4412dd71a98012db25a3535bbfe171a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2c84e7b41a841a230ed5f8a42309aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/80f5a0e8-832b-4b49-a2bf-c8e39893899c.png?resizew=268)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/f7548380-7820-4b02-937c-d6a9350dbaed.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/af57deb0-f9c4-4a4a-a617-b89a37e24a2a.png?resizew=194)
(1)若图3构成正八边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17d4a6cf11cda87b3dfafaecdec683f.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9587df831df1af5e7dd6be5fdc7bd8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
①求实数m的取值范围;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cca093c8d357efeb34eae478368e58e.png)
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解题方法
2 . 英国著名物理学家牛顿曾研究过函数
的图象,其形恰如希腊神话中海神波塞冬的武器——三叉戟,因此
的图象又称为牛顿三叉戟曲线.
![](https://img.xkw.com/dksih/QBM/2023/1/30/3164161277140992/3165396944830464/STEM/8a6379f872ad4def83630a9f16099d23.png?resizew=198)
(1)证明:
在
上为减函数;
(2)当
时,不等式
恒成立,求实数m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfee2c4efc91317d8e0ade4c839d863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://img.xkw.com/dksih/QBM/2023/1/30/3164161277140992/3165396944830464/STEM/8a6379f872ad4def83630a9f16099d23.png?resizew=198)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9414348d57c7fc77dcfa8f0744cb0c9.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2db972e67f3cfa05cbc69bec992839.png)
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解题方法
3 . 已知
表示不超过x的最大整数,称为高斯取整函数,例如
,
,方程
的解集为A,集合
,且
,则实数a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f31440853c8c682388f648915a8877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e242589e3f0b92320ee8238c563d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db89fe2125009846e87d1c81aabe1c3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fc96454ec686aab2319177710dacb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95321d0e551daa25104d32157249c23d.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2020-10-29更新
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6卷引用:知识点03 交集、并集-2021-2022学年高一数学同步精品课堂讲+例+测(苏教版2019必修第一册)
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