对于一个四位正整数,若满足百位数字与十位数字之和是个位数字与千位数字之和的两倍,则称该四位正整数为“希望数”,例如:四位正整数3975,百位数字与十位数字之和是16,个位数字与千位数字之和8,而16是8的两倍,则称四位正整数3975为“希望数”,类似的,四位正整数2934也是“希望数”.
根据题中所给材料,解答以下问题:
(1)请写出最小的“希望数”是________;最大的“希望数”是_______;
(2)对一个各个数位数字均不超过6的“希望数m,设
,若个位数字是千位数字的2倍,且十位数字和百位数字均是2的倍数,定义:
,求
的最大值.
根据题中所给材料,解答以下问题:
(1)请写出最小的“希望数”是________;最大的“希望数”是_______;
(2)对一个各个数位数字均不超过6的“希望数m,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1e07c53fdff2b5d988a8226dca78e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad248d7027e75eebdac277c8216ea516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bb215f28e5eea7ff4c7ca5ee9e2216.png)
更新时间:2021-01-29 09:53:31
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【推荐1】
表示4与1两数在数轴上所对应的两点之间的距离:
可以看做
,表示4与
两数在数轴上所对应的两点间的距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/65a6c6e8-0ed8-4c55-a976-53907b839f70.png?resizew=291)
(1)在数轴上,有理数5与
所对应的两点之间的距离为________;
(2)结合数轴找出所有符合条件的整数
,使得
,则
________;
(3)利用数轴分析,若
为整数,
,则满足条件的所有
的值的和为_______;
(4)若
为有理数,则
的最小值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b931d78073a59ec476a7084d2150ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722f9170ef7bb8a58be8e267cff651ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9825e527fe6cb8afbf5268be1de1ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/65a6c6e8-0ed8-4c55-a976-53907b839f70.png?resizew=291)
(1)在数轴上,有理数5与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(2)结合数轴找出所有符合条件的整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23141e8cd7ae578e5cf7cccc01097f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(3)利用数轴分析,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e7f5f0b2e6fb447b5050a3c3fda074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】特殊与一般是重要的数学方法,当我们遇到复杂问题时,可以通过特殊情况下的分析尝试,积累经验再进行一般化的研究.
(1):若
,则
的值确定吗?若确定,求出确定的值;若不确定,说明理由;
特例分析:当
时,
__________;当
时,
__________;
一般化研究:若
,则
__________;
(2):若
,
,求
的值;
(3):若
,且
,
,
,……,
,
这2024个数中有
个正数,则
的值为__________(用含
的式子表示).
(1):若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901253fc5f1cb0fcddd64f5df4a7c8e7.png)
特例分析:当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c382494539aaf2b158fcb3f5b1309ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ea15af97e2d7ccaf5c710c6d3d8cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c382494539aaf2b158fcb3f5b1309ba.png)
一般化研究:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f0e9c04402a0ffdaa25c3e3c82c7dd.png)
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(2):若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162849c3ba37c94f4184db3897a2e243.png)
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(3):若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba6b0f8d43e5dc374d9411d4d8acd6c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd4ed30a6e346b92f00d238f16679f7.png)
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【推荐3】在数轴上,把原点记作点O,表示数a的点记作点A.对于数轴上任意一点P(不与点O、点A重合),将线段
与线段
的长度之比定义为点P关于点A的幸福值,记作
,即
,例如:点P表示的数为1,点A表示的数为3,因为
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.
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(1)当点P是线段
的中点时,点P关于点A的幸福值
;
(2)若点P表示的数为
,点A表示的数为3,点P关于点A的幸福值
;
(3)若点P表示的数为2,点A表示的数为a,点P关于点A的幸福值
,求点A表示的数a;
(4)若点P表示的数为p,点A表示的数为a,
,则点P关于点A的幸福值
;
(5)点
、点
为数轴上两个不同的点,并且点
与
关于原点对称,点
表示的数为m,点A、点B分别表示数a、2,若
,则a、m需满足条件: .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/23/ae77a3fb-1338-42d0-a3dc-942500470900.png?resizew=361)
(1)当点P是线段
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(2)若点P表示的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c030203651afe65d81af7e21476eaafb.png)
(3)若点P表示的数为2,点A表示的数为a,点P关于点A的幸福值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77083c0a253c7bfb7cad772eadc92c4f.png)
(4)若点P表示的数为p,点A表示的数为a,
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(5)点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
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【推荐1】【阅读理解】在平面直角坐标系
中,对于任意两点
,
,
,
,我们将
称为点
与点
的“直角距离”,记作
.
例如:点
与点
的“直角距离”
.
【问题解决】
(1)已知点
坐标为
.
①点
与点
的“直角距离”
;
②若点
与点
的“直角距离”
,则
的值为 .
(2)已知
和
.
①在点
,
,
中,到
,
两个点的“直角距离”之和相等的两个点是 ;
②若点
到
,
两个点的“直角距离”之和为6,则
,
的取值范围分别是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e743e9dd8d3666f934faf6771dcdce31.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222073dfd723d8f6602a7c1455d338b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24529eadaef974ec0625f8ca40682e51.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ecd750c71427b090cb2c700611adac6.png)
例如:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2857f75cfb98c78e0d96dfd4d7d0240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb94feb21940ac8ec3fa0ee8daac034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54aa3ac7eae2a8302d379f1e6440258c.png)
【问题解决】
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c38f266df4834d1e546d66547b80220.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6868a51ea0a78f2605d3d1cbe701351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e575df8da4607dfc271c30a98c0730.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e95f3e91d67f61820385231b6025b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386c0edb7849750cdadb70970be53392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3c4efe7471c04ffefb723dc01b1655.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f4f980d0129368dc720886636e1f1b.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb95959fb22c74e9ba08ab2eea44205.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c608bc19b43c9def034f44cf5dd966d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da77acb6d916840f572717ddfec88d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64d924836b4292239d9726c6473d7f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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名校
【推荐2】已知:
和
互为相反数,
和
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【推荐1】电影《我和我的祖国》在我市上演,上周周一到周五某电影院观看电影人数如下表:(超过500人记为正,少于500人记为负)
求:(1)上周星期四观看电影的人数?
(2)上周观看电影人数最多的一天比最少的一天多多少人?
(3)上周五天平均每天有多少人观看电影?
星期一 | 星期二 | 星期三 | 星期四 | 星期五 |
+57 | -36 | +22 | -18 | -40 |
(2)上周观看电影人数最多的一天比最少的一天多多少人?
(3)上周五天平均每天有多少人观看电影?
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【推荐2】小红爸爸上星期五买进某公司股票1000股,每股28元,星期六和星期天不交易.下表为本周内每日该股票的涨跌情况.(单位:元)
![](https://img.xkw.com/dksih/QBM/2018/1/7/1855344121282560/1859766087884800/STEM/38e3fd31eee24355b18b05bde2c2d4b2.png?resizew=568)
(1)通过上表你认为星期五收盘时,每股是多少元?
(2)本周内每股最高是多少?最低是多少元?
(3)已知股票买入时需交成交额1.5‰的交易费,卖出时需交成交额2.5‰的交易费.若星期五抛出,则小红爸爸这笔股票交易盈亏如何?
![](https://img.xkw.com/dksih/QBM/2018/1/7/1855344121282560/1859766087884800/STEM/38e3fd31eee24355b18b05bde2c2d4b2.png?resizew=568)
(1)通过上表你认为星期五收盘时,每股是多少元?
(2)本周内每股最高是多少?最低是多少元?
(3)已知股票买入时需交成交额1.5‰的交易费,卖出时需交成交额2.5‰的交易费.若星期五抛出,则小红爸爸这笔股票交易盈亏如何?
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