如图,在数轴上,点A表示的数为
,点B表示的数为8,动点P从点A出发,以2个单位每秒的速度沿射线
的方向向右运动,运动时间为t秒(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/590f9614-a02d-47c0-ae88-5e2cf3017ea6.png?resizew=301)
(1)线段
______;点P表示的数为_________﹔
(2)若点P在线段
上,则线段
_______(用含t的代数式表示);
(3)求经过多长时间,使得
三点中有一点恰好是以另外两点为端点的线段的中点?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/590f9614-a02d-47c0-ae88-5e2cf3017ea6.png?resizew=301)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(2)若点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
(3)求经过多长时间,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59df36dae2d405482c7c5748a492111.png)
22-23七年级上·陕西西安·期末 查看更多[6]
陕西省西安市长安区2022-2023学年七年级上学期数学期末考试试卷陕西省西安市2022-2023学年七年级上学期期末数学试题福建省泉州市2022-2023学年九年级上学期期末数学试卷陕西省宝鸡市凤翔县2022-2023学年七年级上学期期末教学质量调研数学试题广东省阳江市阳春市2022-2023学年七年级上学期数学期末考试试卷(已下线)专题02 数轴上动点问题专项训练-【好题汇编】备战2023-2024学年七年级数学上学期期末真题分类汇编(广东专用)
更新时间:2023-02-15 16:11:31
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解答题-计算题
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【推荐1】如图,点A,O,B在数轴上表示的数分别为
,0,10,点C是数轴上一动点,其表示的数为x.
(1)若点C到A、B两点的距离相等,点C表示的数是 ;
(2)若点C到点B的距离是点C到点A距离的3倍,则点C对应的数应是多少?请写出你的推理计算过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/f7260c6f-679e-4690-9bdd-790d0a0d38a7.png?resizew=374)
(1)若点C到A、B两点的距离相等,点C表示的数是 ;
(2)若点C到点B的距离是点C到点A距离的3倍,则点C对应的数应是多少?请写出你的推理计算过程.
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【推荐2】结合数轴与绝对值的知识回答下列问题:
和
的两点之间的距离是______; 表示
和
的两点之间的距离是________;一般地,数轴上表示数
和数
的两点之间的距离等于
.
(2)如果表示数
和
的两点之间的距离是
,那么
__________.
(3)若
, 且数
在数轴上表示
数分别是点A、点B,则A、B两点间的最大距离是_________ ,最小距离是_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763e09303b51e5ad13e9ccf983174c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9862c3f79df375b515dc9f707c763444.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/5455c43cfafbffd00d1d5459069fc473.png)
(2)如果表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763e09303b51e5ad13e9ccf983174c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53622747bd20d2bafb86111783852e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://img.xkw.com/dksih/QBM/2023/7/27/3290066416754688/3334711215497216/STEM/aa8a9de2f93b47499e750231a299dda6.png?resizew=14)
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【推荐1】动点A从原点出发向数轴负方向运动,同时,动点B也从原点出发向数轴正方向运动,4秒后两点相距16个单位长度.已知动点A、B的速度比是1:3(速度单位:单位长度/秒).
![](https://img.xkw.com/dksih/QBM/2022/10/6/3081672001642496/3101696174653440/STEM/e8e855f7d3ce42f5a38c3ea9b4d6d2c5.png?resizew=346)
(1)求出两个动点运动的速度,并在数轴上标出A、B两点从原点出发运动4秒时的位置;
(2)若A、B两点从(1)中的位置同时向数轴负方向运动,几秒后原点恰好处在两个动点正中间;
(3)在(2)中A、B两点继续同时向数轴负方向运动时,另一动点C同时从B点位置出发向A运动,当遇到A后,立即返回向B点运动,遇到B点后立即返回向A点运动,如此往返,直到B追上A时,C立即停止运动,若点C一直以25个单位长度/秒的速度匀速运动,那么点C从开始到停止运动,运动的路程是多少单位长度?
![](https://img.xkw.com/dksih/QBM/2022/10/6/3081672001642496/3101696174653440/STEM/e8e855f7d3ce42f5a38c3ea9b4d6d2c5.png?resizew=346)
(1)求出两个动点运动的速度,并在数轴上标出A、B两点从原点出发运动4秒时的位置;
(2)若A、B两点从(1)中的位置同时向数轴负方向运动,几秒后原点恰好处在两个动点正中间;
(3)在(2)中A、B两点继续同时向数轴负方向运动时,另一动点C同时从B点位置出发向A运动,当遇到A后,立即返回向B点运动,遇到B点后立即返回向A点运动,如此往返,直到B追上A时,C立即停止运动,若点C一直以25个单位长度/秒的速度匀速运动,那么点C从开始到停止运动,运动的路程是多少单位长度?
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【推荐2】如图,在数轴上,点
和点
分别表示
和
.动点
从点
出发,沿数轴以每秒
个单位长度的速度向点
运动,当点
运动到点
后,立即以每秒
个单位长度的速度返回,至点A停止运动.设点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/4777a77e-020e-4dba-82b8-b3d4736fe925.png?resizew=358)
(1)当
时,点
表示的数为______;
(2)求点
返回到点A时,
的值;
(3)在点
的整个运动过程中,求点
与点
间的距离
用含
的式子表示
;
(4)在点
的整个运动过程中,当点
与点A间的距离是点
与点
间的距离的
倍时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/4777a77e-020e-4dba-82b8-b3d4736fe925.png?resizew=358)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(4)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐3】如图①,已知点
、
在射线
上,
,
.动点
、
分别从点
、
同时出发,点
以每秒2个单位长度的速度沿射线
匀速运动,点
先以每秒4个单位长度的速度从点
向点
匀速运动,到达点
后,再以每秒3个单位长度的速度沿射线
匀速运动,当点
与点
第二次重合时,
、
同时停止运动.设点
运动时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/baf15afe-73ba-49bc-82d3-36de80e50363.png?resizew=408)
(1)线段
的长为 .
(2)当点Q返回到点B时,求t的值.
(3)在点Q从点B向点A的运动过程中,当
时,求t的值.
(4)如图②,过点
作直线
,点
、
在直线
上,且
,
.在
、
运动过程中,当
与
面积相等时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ebd1d359040a1172a944ded96ed0127.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/baf15afe-73ba-49bc-82d3-36de80e50363.png?resizew=408)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当点Q返回到点B时,求t的值.
(3)在点Q从点B向点A的运动过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d14c6959273338a048b023805cce80.png)
(4)如图②,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f56d4a08e50b95c1033c1ea3380c64.png)
![](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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2e3ad8a49f5e92666ac4b37c5cc148.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900a92a036a4a8b044f5a13f55fcc505.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a9dabb53dc826019fc8b6ae6d940c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b137dd52bb7ff682868bc70c61f881f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】如图,已知A,B两点在数轴上,点A表示的数为﹣10,OB=3OA,点M以每秒3个单位长度的速度从点A向右运动.点N以每秒2个单位长度的速度从点O向右运动(点M,点N同时出发).
(1)数轴上点B对应的数是 .
(2)当点M运动到距离点O为2个单位长度时,所经过的时间是 .
(3)经过几秒,点M,点N分别到原点O的距离相等?
(1)数轴上点B对应的数是 .
(2)当点M运动到距离点O为2个单位长度时,所经过的时间是 .
(3)经过几秒,点M,点N分别到原点O的距离相等?
![](https://img.xkw.com/dksih/QBM/2022/1/5/2888034113593344/2888406211469312/STEM/acee75593df54c419f07f9a691def951.png?resizew=330)
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名校
【推荐2】己知数轴上三点
,
,
对应的数分别为
,
,
,点
为数轴上任意一点,其对应的数为
.
(1)
、
两点间的距离是
,
是数轴上
之间的点,且点
到点
的距离是点
到点
的距离的
倍,那么
的值是___________;
(2)数轴上是否存在点
,使点
到点
,点
的距离之和是
?若存在,请直接写出
的值;若不存在,请说明理由;
(3)如果点
以每分钟
个单位长度的速度从点
向左运动,同时点
和点
分别以每分钟
个单位长度和每分钟
个单位长度的速度也向左运动,设
分钟后点
到点
、点
的距离相等,直接写出
的值___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67312d6fbde2db992b25a11f4ec102b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/6db95262-2165-4fc6-a8a9-28571327352f.png?resizew=258)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fb32a03264151340401a243118d973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)数轴上是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc032171884de00fe8b2128dcafd196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐3】数轴是研究初中数学知识的一个重要工具,利用数轴可以将数与形完美的结合,研究数轴我们发现了许多重要的规律.已知
与
两个数在数轴上对应的点分别为点
、
,根据绝对值的概念可知点
到原点的距离表示为
,点
原点的距离表示为
,若
时,求
、
两点之间的距离.
小明利用绝对值的概念,结合数轴,进行了探索:
(1)补全小明的探索;
(2)数轴上表示2和5的两点之间的距离是________;数轴上表示
和6的两点之间的距离是________,数轴上表示数
和
的两点之间的距离是3,那么
________;
(3)把题目中
的条件去掉,
与
两个数在数轴上对应的点分别为点
、
,则
、
两点之间的距离可表示为________(用含
、
的代数式表示);
(4)把一条数轴在数
处对折,使表示
和2021两数的点恰好重合,则
________;
(5)①若数轴上表示数
的点位于
与2之间,则
有最小值,最小值为________;
②
的最小值为________.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f50db7df4039c3fb42c49ea377228c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c1eb540e5c6aad20c4f42a01b8d35b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
小明利用绝对值的概念,结合数轴,进行了探索:
因为![]() 情况一:若 ![]() ![]() ![]() ![]() ![]() ![]() 图① …… |
(2)数轴上表示2和5的两点之间的距离是________;数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
(3)把题目中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(4)把一条数轴在数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25943a346241d2cca3b4915b8fa7be89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(5)①若数轴上表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141f7ecffa7054d8211703a38dcdc026.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358b26e49605c1b32460f51ad77c725b.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,点C,D在线段
上,且
,E是线段
的中点,若
,求线段
的长.
请将下面的解题过程补充完整;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/40ceaa9b-ddec-4a6d-b594-f4cd7a59e574.png?resizew=348)
解:设
.
∵
,
∴
.
又∵点E是线段
的中点,
∴
________(用含x的代数式表示),
∴
_________(用含x的代数式表示).
又∵
,
可得方程___________,
解方程得___________.
∴
__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471f7ddc061db5c6cd5cf3199325410a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2913823e6629e26f00a1f1346e29338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
请将下面的解题过程补充完整;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/40ceaa9b-ddec-4a6d-b594-f4cd7a59e574.png?resizew=348)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bfc0387785bf3c60f75ed3d34cc98a.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471f7ddc061db5c6cd5cf3199325410a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45577fdfc23c408c6b47477ceecc8a7.png)
又∵点E是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151ef507d5df4ea22619715ca26bf743.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17520701296f35586dc4bb57827050f0.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2913823e6629e26f00a1f1346e29338.png)
可得方程___________,
解方程得___________.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,C为线段AB上一点,点D为BC的中点,且AB=18cm,AC=4CD.
(1)图中共有 条线段;
(2)求AC的长;
(3)若点E在直线AB上,且EA=2cm,求BE的长.
(1)图中共有 条线段;
(2)求AC的长;
(3)若点E在直线AB上,且EA=2cm,求BE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/4eac53ed-d27b-4136-924f-aff3162fffae.png?resizew=322)
您最近一年使用:0次