如图,点A,B,C,D在数轴上,点A表示的数是-16,点C表示的数是18,
(单位长度),
(单位长度).
![](https://img.xkw.com/dksih/QBM/2022/1/11/2891930456145920/2944487306067968/STEM/0855a652-0709-4a25-8221-7eed1f211cb0.png?resizew=473)
(1)点B表示的数是______,点D表示的数是______,线段AD等于______;
(2)若线段AB以4个单位长度/秒的速度向右匀速运动,同时线段CD以2个单位长度/秒的速度向左匀速运动,设运动时间为t秒.
①当
(单位长度)时,求t的值.
②设M为AC的中点,N为BD的中点,当
时,求线段MN的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2891930456145920/2944487306067968/STEM/0855a652-0709-4a25-8221-7eed1f211cb0.png?resizew=473)
(1)点B表示的数是______,点D表示的数是______,线段AD等于______;
(2)若线段AB以4个单位长度/秒的速度向右匀速运动,同时线段CD以2个单位长度/秒的速度向左匀速运动,设运动时间为t秒.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
②设M为AC的中点,N为BD的中点,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c104d9088486ac1a7072482d2167aa52.png)
更新时间:2022-03-26 12:37:40
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【推荐1】已知a,b,c在数轴上的位置如图所示,所对应的点分别为A,B,C.
(1)填空:A,B之间的距离为 ,B,C之间的距离为 .
(2)化简:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/8cae689c-c013-4fbc-b0c2-0ae7f5c5210f.png?resizew=210)
(1)填空:A,B之间的距离为 ,B,C之间的距离为 .
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf7de13f0f3fd85ecd022e857e6f6fa.png)
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【推荐2】点
,
,
为数轴上的三点,如果点
在点
,
之间,且到点
的距离是点
到点
的距离的3倍,那么我们就称点
是
,
的奇妙点.例如,如图1,点
表示的数为
,点
表示的数为1.表示0的点
到点
的距离是3,到点
的距离是1,那么点
是
,
的奇妙点;又如,表示
的点
到点
的距离是1,到点
的距离是3,那么点
就不是
,
的奇妙点,但点
是
,
的奇妙点.
(1)点
表示的数为1,点
表示的数为2,点
表示的数为5,
是否为
,
的奇妙点?请说明理由.
(2)如图2,
,
为数轴上的两点,点
所表示的数为
,点
所表示的数为6.表示数 的点是
,
的奇妙点;表示数 的点是
,
的奇妙点;
(3)如图3,
,
为数轴上的两点,点
所表示的数为
,点
所表示的数为50.现有一动点
从点
出发向右运动,点
运动到数轴上的什么位置时,
为其余两点的奇妙点?
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/c8f4a1e0a1fa26cacede71c7fdda3a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858f6de67d9003208728b5262e40251d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/c8f4a1e0a1fa26cacede71c7fdda3a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858f6de67d9003208728b5262e40251d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f4a1e0a1fa26cacede71c7fdda3a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/858f6de67d9003208728b5262e40251d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a8e0e65974cce627a67af1d2845e78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7923e8f191a34a8246a3e3937850c6b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/d69732ee-f677-4248-9598-53a4617b147e.png?resizew=349)
(1)点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300d3483c39ab8ba37d233d8a15000f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7923e8f191a34a8246a3e3937850c6b9.png)
(2)如图2,
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12eedb49e12611720e081416f9e2fea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3550c48a81ab687bbcdd8fdc6931701f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e6cee6e949cf40b277690cd353ca65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946f91af485fb2f0129e993c30d24dcf.png)
(3)如图3,
![](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/32e22e1223baf7cb3d53e668c2449609.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐1】已知:在一条东西向的双轨铁路上迎面驶来一快一慢两列火车,快车长
(单位长度),慢车长
(单位长度),设正在行驶途中的某一时刻,如图,以两车之间的某点
为原点,取向右方向为正方向画数轴,此时快车头
在数轴上表示的数是
,慢车头
在数轴上表示的数是
,且
与
互为相反数.(忽略两辆火车的车身及双铁轨的宽度.)
(1)求此时刻快车头
与慢车头
之间相距 单位长度;
(2)从此时刻开始,若快车
以
个单位长度
秒的速度向右匀速继续行驶,同时慢车
以
个单位长度
秒的速度向左匀速继续行驶,再行驶 秒两列火车的车头
、
相距
个单位长度;
(3)在(
)中快车、慢车速度不变的情况下,此时在快车
上有一位爱动脑筋的七年级学生乘客
,他发现行驶中有一段时间
秒钟内,他的位置
到两列火车头
、
的距离和加上到两列火车尾
、
的距离和是一个不变的值(即
为定值),则这段时间
是 秒,定值是 单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f72b3b0585781a8f33a880d60759cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c85a664e8a18dea89249794763fca06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/ac8ce53b-a153-432f-b63c-ae3382e43b52.jpg?resizew=230)
(1)求此时刻快车头
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)从此时刻开始,若快车
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](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/d07ae0b4264da6a8812454ffd2f20d94.png)
(3)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1629bf48cd875b993d79ba799ee934c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】已知:如图,点A、点B为数轴上两点,点A表示的数为a,点B表示的数为b,a与b满足
.动点P从点A出发,以2个单位长度/秒的速度沿数轴向右运动,若在点B处放一挡板(挡板厚度忽略不计),点P在碰到挡板后立即返回,以3个单位长度/秒的速度在数轴上向左运动,到点A停止,设点P运动的时间为t(秒)(t>0).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/8444a1c2-c573-4206-bf7f-746ae193656d.png?resizew=195)
(1)直接写出a、b的值,
______,
______;
(2)点P碰到挡板时,t的值为______;
(3)当
时,点P表示的有理数为______;当
时,点P表示的有理数为______;
(4)试探究:点P到挡板的距离与它到原点的距离可能相等吗?若能,直接写出相等时t的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0823598160833b8ebeb5395a5ca3970.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/8444a1c2-c573-4206-bf7f-746ae193656d.png?resizew=195)
(1)直接写出a、b的值,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)点P碰到挡板时,t的值为______;
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15a13b4190ac3d5feaee27a4c97b21b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c430e1f025dc791c2e5ab17f57719882.png)
(4)试探究:点P到挡板的距离与它到原点的距离可能相等吗?若能,直接写出相等时t的值;若不能,请说明理由.
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【推荐3】如图所示,在数轴上点A、B、C表示的数分别为﹣2,1,6,点A与点B之间的距离表示为AB,点B与点C之间的距离表示为BC,点A与点C之间的距离表示为AC.
(1)则AB= ,BC= ,AC= ;
(2)点A、B、C开始在数轴上运动,若点A以每秒1个单位长度的速度向左运动,同时,点B和点C分别以每秒2个单位长度和5个单位长度的速度向右运动.请问:BC﹣AB的值是否随着运动时间t的变化而改变?若变化,请说明理由;若不变,请求其值;
(3)由第(1)小题可以发现,AB+BC=AC.若点C以每秒3个单位长度的速度向左运动,同时,点A和点B分别以每秒1个单位长度和每秒2个单位长度的速度向右运动.请问:随着运动时间t的变化,AB、BC、AC之间是否存在类似于(1)的数量关系?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/019797d9-4834-4064-ab36-e59b098f4ebc.png?resizew=298)
(1)则AB= ,BC= ,AC= ;
(2)点A、B、C开始在数轴上运动,若点A以每秒1个单位长度的速度向左运动,同时,点B和点C分别以每秒2个单位长度和5个单位长度的速度向右运动.请问:BC﹣AB的值是否随着运动时间t的变化而改变?若变化,请说明理由;若不变,请求其值;
(3)由第(1)小题可以发现,AB+BC=AC.若点C以每秒3个单位长度的速度向左运动,同时,点A和点B分别以每秒1个单位长度和每秒2个单位长度的速度向右运动.请问:随着运动时间t的变化,AB、BC、AC之间是否存在类似于(1)的数量关系?请说明理由.
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【推荐1】电动出租车以绿色环保受到市民的广泛欢迎,给市民的生活带来了很大方便,下表是行驶15公里以内普通燃油出租车和纯电动出租车的运营价格:
老张每天从家去单位打出租车上班(路程在15公里以内),结果发现正常情况下乘坐纯电动出租车比燃油出租车节省0.8元,求老张家到单位的路程是多少公里?
车型 | 起步公里数 | 起步价格 | 超出起步公里数后的单价 |
普通燃油型 | 3 | 13元 | 2.3元/公里 |
纯电动型 | 3 | 8元 | 2元/公里 |
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适中
(0.65)
【推荐2】【观察发现】如图,一些点按照一定的规律排列:点
,点
,点
,点
,点
,…
(1)直接写出:点
的坐标为______;点
的坐标为______.
(2)用含
(
为正整数)的代数式表示点
的坐标为______,点
的坐标为______.
(3)在(2)的条件下,若点的坐标为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c7f93ae305d67cf31b751e768ae48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8983ad764a160aeb0b8193697294b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66c353b6b9186af33a36240be6c52f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df56df0ee7e39607577ad8bf0e4d6bb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8f228e3bf85fe972e99c73b1ac5597.png)
(1)直接写出:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd23f3dd69b74faf3894ae4906491e72.png)
(2)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a29fef95ed54dcf5c653749f5e9d232.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925be8927ea9b4f42bf9519eb8c55405.png)
(3)在(2)的条件下,若点的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8ff26ee9eee641d847ee57bf140152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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