阅读下面一段文字:
在数轴上点A,B分别表示数a,b.A,B两点间的距离可以用符号
表示,利用有理数减法和绝对值可以计算A,B两点之间的距离
.
例如:当a=2,b=5时,
=5-2=3;当a=2,b=-5时,
=
=7;当a=-2,b=-5时,
=
=3.综合上述过程,发现点A、B之间的距离
=
(也可以表示为
).
请你根据上述材料,探究回答下列问题:
(1)数轴上表示1和3两点之间的距离是 ;
(2)表示数a和-2的两点间距离是6,则a= ;
(3)如果数轴上表示数a的点位于-4和3之间,求
的值.
(4)是否存在数a,使代数式
的值最小?若存在,请求出代数式的最小值,并直接写出数a的值或取值范围,若不存在,请简要说明理由.
在数轴上点A,B分别表示数a,b.A,B两点间的距离可以用符号
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
例如:当a=2,b=5时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a013738b5c260c3c2da48506ea07e9f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad29f82df9d95de9796e6cf8ca7ae747.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05da40a2d7dab5d6a003906ca19d4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd9674cc80cda98786f60419acab09f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ee31878ce40ec6615515d0acaa77de.png)
请你根据上述材料,探究回答下列问题:
(1)数轴上表示1和3两点之间的距离是 ;
(2)表示数a和-2的两点间距离是6,则a= ;
(3)如果数轴上表示数a的点位于-4和3之间,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195a63039edff2c02bf27a2da98e1b81.png)
(4)是否存在数a,使代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6456cd700a1f24a2cdf770fcb6cf587c.png)
19-20七年级上·北京怀柔·期末 查看更多[5]
北京市怀柔区2019-2020学年七年级上学期期末数学试题(已下线)第一章 有理数(基础过关)-2020-2021学年(京改版)七年级数学上册单元测试卷(已下线)专题1.47 《有理数》全章复习与巩固(巩固篇)(专项练习)-2022-2023学年七年级数学上册基础知识专项讲练(人教版)(已下线)专题2.39 《有理数及其运算》全章复习与巩固(巩固篇)(专项练习)-2022-2023学年七年级数学上册基础知识专项讲练(北师大版)四川省达州市渠县第三中学2023-2024学年七年级上学期期末数学模拟测试题
更新时间:2020-01-30 07:41:31
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【推荐1】如图,
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/82c6c845-071a-4f05-8e3d-21035178d7d3.png?resizew=193)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1051ef731f266dbf72ccb19dc222bf2d.png)
(2)若电子蚂蚁
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030be665f4ce91c0e951c55cb685b3e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-问答题
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(0.65)
名校
【推荐2】已知,在数轴上点
表示的数是
;点
在点
的右侧,且到点
的距离是6;点
在点
与点
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的距离是到点
距离的2倍.
(1)点
表示的数是______;点
表示的数是______;
(2)若点
表示的数是
,点
表示的数是
,点
表示的数是
,
是数轴上任意一点,
有最______值,是______.
(3)若点
从点
出发,沿数轴以每秒2个单位长度的速度向右匀速运动;同时,点
从点
出发,沿数轴以每秒1个单位长度的速度向左匀速运动.设运动时间为
秒,当
为何值时,点
与点
相遇?此时点
、点
在数轴上表示的数是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(3)若点
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