已知,A、B在数轴上对应的数分别用a、b表示,且(a-20)2+|b+10|=0,P是数轴上的一个动点.
(1)在数轴上标出A、B的位置,并求出A、B之间的距离;
(2)已知线段OB上有点C且|BC|=6,当数轴上有点P满足PB=2PC时,求P点对应的数;
(3)动点P从原点开始第一次向左移动1个单位长度,第二次向右移动3个单位长度,第三次向左移动5个单位长度,第四次向右移动7个单位长度,…….点P能移动到与A或B重合的位置吗?若不能,请直接回答;若能,请直接指出,第几次移动,与哪一点重合.
(1)在数轴上标出A、B的位置,并求出A、B之间的距离;
(2)已知线段OB上有点C且|BC|=6,当数轴上有点P满足PB=2PC时,求P点对应的数;
(3)动点P从原点开始第一次向左移动1个单位长度,第二次向右移动3个单位长度,第三次向左移动5个单位长度,第四次向右移动7个单位长度,…….点P能移动到与A或B重合的位置吗?若不能,请直接回答;若能,请直接指出,第几次移动,与哪一点重合.
![](https://img.xkw.com/dksih/QBM/2019/10/30/2323354733584384/2325039022448640/STEM/54bd3857d3ca409cbbf9dd4ed652a025.png?resizew=296)
19-20七年级上·福建泉州·阶段练习 查看更多[2]
更新时间:2019-11-02 08:06:54
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相似题推荐
解答题-问答题
|
较难
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【推荐1】如图:在数轴上
点表示数
点示数
点表示数
是最大的负整数,
在
左边两个单位长度处,
在
右边
个单位处
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
;
_;
_;
若将数轴折叠,使得
点与
点重合,则点
与数_ __表示的点重合;
点
开始在数轴上运动,若点
以每秒
个单位长度的速度向左运动,同时,点
和点
分别以每秒
个单位长度和
个单位长度的速度向右运动,假设
秒钟过后,若点
与点
之间的距离表示为
点
与点
之间的距离表示为
点
与点
之间的距离表示为
,则
_ _,
_ _,
__ _;(用含
的代数式表示)
请问:
的值是否随着时间
的变化而改变﹖若变化,请说明理由;若不变,请求其值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efbbcbcad9de527409a6609c6a10def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72fdceab1300671548fc30907ac178b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a5b8124e636e8e954ac977ad1b4724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a2a5f277bab230e7e65ee5b8b53a1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
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【推荐2】如图1,已知点A,
在数轴上表示的数分别为
和10,若有一动点
从数轴上点A出发,以每秒1.5个单位长度的速度沿数轴向右匀速运动,设运动时间为
秒.
(1)解决问题:
若点
为线段
的中点,点
为线段
的中点,点
在线段
上运动时,线段
的长度是否发生变化?请说明理由;
(2)探索问题:
当点
运动的同时,点
从点
出发,以每秒3个单位长度的速度沿着数轴向左匀速运动.
①在运动过程中,点
表示的数为_______,点
表示的数为_______.
②求运动多少秒时,点
与点
相距3个单位长度?
(3)知识迁移:
如图2,若线段
与
分别为同一钟表上某一时刻的时针与分针,
,在时针与分针转动过程中,经过______分钟后,
的度数第一次等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef63ad7b61f3fae0ac81148e7700ff.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/2024/1/20/3959eb36-8bc9-4e3e-aea8-92d6cf959604.png?resizew=239)
(1)解决问题:
若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)探索问题:
当点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
①在运动过程中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②求运动多少秒时,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(3)知识迁移:
如图2,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee6e9272380b8f02c3f1e6eb3e97036.png)
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(0.4)
【推荐3】已知数轴上
三点,若点
在点
之间且
,则称点
是
的和谐点.例如,图1中,点
表示的数分别为
,1,0,
,此时
,
,则点
是
的和谐点,点
是
的和谐点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/0de96019-7120-4b18-a156-81bee077195a.png?resizew=316)
(1)如图
,数轴上点
,
表示的数分别为
,5,若点
是
的和谐点,则点
表示的数是 ;若点
是
的和谐点,则点
表示的数是 ;
(2)已知点A、B、C、D在数轴上,它们表示的数分别为数a, b, c, d, 且a,b满足
,点C在点B的右侧且到点B的距离为8个单位长度,点D表示的数是12;动点P从点A出发以4单位/秒的速度向右运动.同时点Q从点D出发,以2个单位/秒速度向左运动,B、C两点之间为“变速区”,规则为从点B运动到点C期间速度变为原来的2倍,之后立刻恢复原速,从点C运动到点B期间速度变为原来的一半,之后立刻恢复原速,假设运动时间为
秒,
①从B运动到C的过程中,点P表示的数是 ,从C运动到B的过程中,点Q 表示的数是 ;(用含t的代数式表示)
②求使得点C是
的和谐点的
值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3350683bb2aaa57df30e2bc6a8e185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2740d2f1f18082f6299bd23e0be289c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3350683bb2aaa57df30e2bc6a8e185.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed8c669fef4499f763667dee16e952c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/0de96019-7120-4b18-a156-81bee077195a.png?resizew=316)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b22985e41187b41f6ee026aa3987764.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/f3a603967d1125edea4aac2a08f87529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
(2)已知点A、B、C、D在数轴上,它们表示的数分别为数a, b, c, d, 且a,b满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ef07440859e3fe64d57243fd8cde22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①从B运动到C的过程中,点P表示的数是 ,从C运动到B的过程中,点Q 表示的数是 ;(用含t的代数式表示)
②求使得点C是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eece45d41e130876c650d7ab15c1d42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解题方法
【推荐1】已知数轴上有两点
,点
对应的数为
,点
在点
的右边,且距离
点16个单位,点
为数轴上一动点,其对应的数为
.
(1)若点
到点
、点
的距离相等,求点
对应的数;
(2)是否存在这样的点
,使点
到点
、点
的距离之和为18?若存在,请求出
的值;若不存在,请说明理由:
(3)点
是数轴上另一个动点,动点
分别从
同时出发,点
以每秒6个单位长度的速度沿数轴向右匀速运动,点
以每秒3个单位长度的速度沿数轴向左匀速运动,
为
的中点,点
在线段
上,且
,设运动时间为
.
①求数轴上点
表示的数(用含
的式子表示);
②
为何值时,
距离为4?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)若点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)是否存在这样的点
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ab777ec34d75a1e58039194ac85c9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301ffce19cc317ba518489f1ab17ac8a.png)
①求数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/27/b651c512-16dd-4c80-b18f-e6c8dd13dc42.png?resizew=420)
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【推荐2】如图,数轴上的单位长度为1,A、B两点表示的数是互为相反数;
(1)点A表示的数是 ,点B表示的数是
(2)数轴上一个动点P先向左移动2个单位长度,再向右移动5个单位到达点M,若点M表示的数是1,则点P所表示的数是
(3)【背景知识】数轴上,点A、B表示的数分别记为a、b,当点P在A、B之间,且到A、B的距离相等,即PA=PB,则点P表示的数可记为
.
若点A、点B分别以2个单位长度/秒和0.5个单位长度/秒的速度向右运动,点P以1个单位长度/秒的速度从O点向右运动.当三点同时运动时,不妨设运动时间为t秒,(t>0)
①点P表示的数为 ;点A表示的数为 ;点B表示的数为 .(用含t的式子表示)
②当t为何值时,点A、点B、点P三点之间恰好有一个点到其他两个点的距离相等?
(1)点A表示的数是 ,点B表示的数是
(2)数轴上一个动点P先向左移动2个单位长度,再向右移动5个单位到达点M,若点M表示的数是1,则点P所表示的数是
(3)【背景知识】数轴上,点A、B表示的数分别记为a、b,当点P在A、B之间,且到A、B的距离相等,即PA=PB,则点P表示的数可记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde91b26dd64477ac405b6fa46af07fb.png)
若点A、点B分别以2个单位长度/秒和0.5个单位长度/秒的速度向右运动,点P以1个单位长度/秒的速度从O点向右运动.当三点同时运动时,不妨设运动时间为t秒,(t>0)
①点P表示的数为 ;点A表示的数为 ;点B表示的数为 .(用含t的式子表示)
②当t为何值时,点A、点B、点P三点之间恰好有一个点到其他两个点的距离相等?
![](https://img.xkw.com/dksih/QBM/2018/10/31/2065351848378368/null/STEM/453f39cb92fb4a668f5e47d4c10f856d.png?resizew=432)
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【推荐3】在数轴上,点M和点N分别表示数
和
,可以用绝对值表示点M、N两点间的距离
,
.
(1)在数轴上,点A、B、C分别表示数
、2、x,解答下列问题:
①
______;
②若
,则x的值为______;
③若
,且x为整数,则x的取值有______个.
(2)在数轴上,点D、E、F分别表示数
、4、6.
①动点P在数轴运动.动点P在数轴上表示的数是x,则
的最小值为______;
②动点P沿数轴从点D开始运动,到达F点后立刻返回,再回到D点时停止运动.在此过程中,点P的运动速度始终保持每秒2个单位长度.当点P的运动时间为______秒时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d7224242ab75080dfb394a39ebf7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bf1f0454337d7bf288b165e1f1c520.png)
(1)在数轴上,点A、B、C分别表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5267ff7ce5aa65879b770aa1990c0a7.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78594ffdc226620b85bce3c7786be3fc.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5a2c31c89b9baf3e9ac466e435183e.png)
(2)在数轴上,点D、E、F分别表示数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
①动点P在数轴运动.动点P在数轴上表示的数是x,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280b27caff74121362233f3c01dde612.png)
②动点P沿数轴从点D开始运动,到达F点后立刻返回,再回到D点时停止运动.在此过程中,点P的运动速度始终保持每秒2个单位长度.当点P的运动时间为______秒时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101ba8c766e22b5db952332fac1bb3d2.png)
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