1 . 设n是正整数,则
按整数部分的大小可以这样分组:
整数部分为1:
,
,
;
,
,…,
.
整数部分为2:
,
,…
;
,
,…
.
整数部分为3:
,
,…
;
,
,…
.
(1)若
的整数部分为4,则n的最小值、最大值分别是多少?
(2)若
的整数部分为5,则n可能的值有几个?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca53100e2d3f9d183c7e91f5614d3a85.png)
整数部分为1:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a296a24acd3033698f0b1a1ad23043ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925fef7cb69e8e32f59e21f90df70149.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55df059a3e31d7decf2e2a657541d43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9317a6b2be7cdf9b7979f008750678e7.png)
整数部分为2:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5a1a7a04d4c10e7a45714482bfb58d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4cee6655a37fc8243928b5dbb09fd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1625d21fa2fb85cf8c02d8e99f175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94de4f4d291d88b8209e2b054a0c16b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f63179dc8eb08d85f0bfbc421cdcebb.png)
整数部分为3:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5be7821872c2f83d39ffaea5216d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27de9e19a52cc1005a2c23c40c54d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8397629ac2094389cd991491413535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d389c74affd07553aa6cca62a34f37bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497a6a46159fa178b630f04d373d1a90.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec531028fbaa18aa1b446e87a652a89.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249094ecb996458e35182d6b461299.png)
您最近一年使用:0次
2023-06-23更新
|
166次组卷
|
8卷引用:安徽省安庆市2022-2023学年七年级下学期5月月考数学试题
安徽省安庆市2022-2023学年七年级下学期5月月考数学试题(已下线)第14讲 实数的运算-【暑假自学课】2023年新七年级数学暑假精品课(浙教版)广东省佛山市南海区南桥学校2022-2023学年七年级下学期第二次月考数学试题(已下线)第04讲 实数的运算(5类题型)-【帮课堂】2023-2024学年七年级数学上册同步学与练(浙教版)(已下线)第03讲 估算、实数(11类热点题型讲练)-【帮课堂】2023-2024学年八年级数学上册同步学与练(北师大版)(已下线)专题2.14 实数(分层练习)(基础练)-2023-2024学年八年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题04实数的综合运算与应用(6种题型)-【好题汇编】备战2023-2024学年八年级数学上学期期中真题分类汇编(北师大版)(已下线)专题13实数(6个知识点4种题型5个中考考点)-【帮课堂】2023-2024学年八年级数学上册同步学与练(苏科版)
名校
2 . 【发现】通过计算,我们发现:
①
;
②
;
③
;
④
.
(1)【猜想】请用字母表示上面发现的规律:
______
.
(2)【验证】试用你所学知识说明这个规律的正确性.
因为
,
又因为任何数的平方______0,(填“
”、“
”、“
”、“
”或“
”)
所以于
______
.(填“
”、“
”、“
”、“
”或“
”)
(3)【应用】根据发现的规律,回答:
①若
,则
有最______值,这个值是______.
②若
,且
均为正数,求
的最大值.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a6d6351eca64c7056b22fe498994d6.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb4050ad00753dbacc86d8710f3bf2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f1cfe7e4fe731eaae3ef09a4ecdeb9.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c56a4aa4e63359c32b66aa1d14848b.png)
(1)【猜想】请用字母表示上面发现的规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a025f648f3051e60bb8924dc0bfb313f.png)
(2)【验证】试用你所学知识说明这个规律的正确性.
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5655aaf7277602866bcead30313800a3.png)
又因为任何数的平方______0,(填“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e119c508fd265e3e3d78749e54fe4f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
所以于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a025f648f3051e60bb8924dc0bfb313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e119c508fd265e3e3d78749e54fe4f43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8536a5ebd76f494c03019086506d8e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(3)【应用】根据发现的规律,回答:
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fa278b5d7c5d18734443a8bd75b3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da0acf25b4a6824678e33097dec09f6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a09184b24c7c594555d0377cdee65a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ab9b3610c3d5e741235fc6c838517c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d993cf0a090de3b01f1dda52c6fdc9f.png)
您最近一年使用:0次
名校
3 . 我们知道,任意一个正整数
都可以进行这样的分解:
(
,
是正整数,且
),在
的所有这种分解中,如果
,
两因数之差的绝对值最小,我们就称
是
的最佳分解,并规定:
.例如:
可分解成
,
或
,因为
,所以
是
的最佳分解,所以![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c8db75fb877a1a531ac987f6ccd4ee.png)
(1)填空:
;
;
(2)一个两位正整数
(
,
,
,
为正整数),交换其个位上的数字与十位上的数字得到的新数减去原数所得的差为
,求出所有的两位正整数;并求
的最大值;
(3)填空:
①
;②
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbaca796cac5a4c6236e87d795fe0b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870c36161f465fc992534b5fc3777f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e70354d6ca5ad9f6b4592fac0b5e559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed737e1b706bc08b3c5102c11f815c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558a2f0d08697660c5122d138807ae4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722b0c0a10755931dc82439b325eb517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89433d60e02fb414435c68aeb984f689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08da658d951fcdb2d4ee8d988dbe18b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89433d60e02fb414435c68aeb984f689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c8db75fb877a1a531ac987f6ccd4ee.png)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1644dc8ce444930d96b4b621233c0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c88d96ce128c193376e40920e01f1.png)
(2)一个两位正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf600e7c995f49c6c96f31faeab615a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2c89e735ed97884d0f8e4e5bbc2f86.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/dd2142368b10234525598c5c32dad846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
(3)填空:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8eeec54ae324e97d3fb75d07efb8a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc15fa2e16aa668dcd5b85731ce8991.png)
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4 . (1)比较下列两个算式的结果的大小(横线上选填
或
)
①
②![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac72c654efc0f0815f5654a10e6c47a2.png)
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1b660cd9aa5e7d87b651f7989a9b8e.png)
(2)观察并归纳(1)中的规律,用含
的一个关系把你的发现表示出来.
(3)若
,且
均为正数,利用你发现的规律,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2545d339d3e4597d7e479478598bc2c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508722ac63fad54126c18c9ebfc89806.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65a62805303d20902d03f2388f22d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac72c654efc0f0815f5654a10e6c47a2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/539ebac5496ebe899ee0b97e99aa6ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1b660cd9aa5e7d87b651f7989a9b8e.png)
(2)观察并归纳(1)中的规律,用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a09184b24c7c594555d0377cdee65a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
您最近一年使用:0次
5 . 将1,2,3,…,16这16个数分成8组
若
.求
的最小值.
必要时可以利用排序不等式(又称排序原理):设
,
为两组实数,
是
的任一排列,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5504861382f2ca2aed9ab3182777a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74213a75dfca346ce418f2c3452ad482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74379907ffa7eb8a3e947163f6f4f02.png)
必要时可以利用排序不等式(又称排序原理):设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d90637cd4ad83768f311888ac4d86ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d6046640460224c08b63dc08741b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9132271894b113f0356c699ed682a924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d6046640460224c08b63dc08741b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e05bac0a76faea6a2c7b4544de87d78.png)
您最近一年使用:0次
2022-03-21更新
|
1726次组卷
|
2卷引用:2023年浙江省宁波市海曙区田莘耕中学七年级数学竞赛试题
名校
6 . 在数轴上,点A表示
,现将点A沿数轴做如下移动,第一次点A向左移动4个单位长度到达点
,第二次将点
向右移动8个单位到达点
,第三次将点
向左移动12个单位到达点
,第四次将点
向右移动16个单位长度到达点
,按照这种规律下去,第n次移动到点
,如果点
与原点的距离不少于18,那么n的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
A.7 | B.8 | C.9 | D.10 |
您最近一年使用:0次