如图,已知在数轴上有A、B两点,点A表示的数是﹣6,点B表示的数是9.点P在数轴上从点A出发,以每秒2个单位的速度沿数轴正方向运动,同时,点Q在数轴上从点B出发,以每秒3个单位的速度沿数轴负方向运动,当点Q到达点A时,两点同时停止运动.设运动时间为t秒.
(1)求AB的距离;
(2)当t=1时,点P、点Q分别表示什么数?
(3)当t为何值时,P,Q两点相距5个单位?
(1)求AB的距离;
(2)当t=1时,点P、点Q分别表示什么数?
(3)当t为何值时,P,Q两点相距5个单位?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/75d81266-d73f-4bea-b8e3-3b04cab2de6f.png?resizew=296)
更新时间:2022-01-12 20:41:21
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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AB=2(单位长度),慢车长CD=4(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O为原点,取向右方向为正方向画数轴,此时快车头A在数轴上表示的数是a,慢车头C在数轴上表示的数是c,且a是单项式-xy的次数的4倍的相反数,c是多项式x2+2x+16的常数项.
温馨提示:忽略两辆火车的车身及双铁轨的宽度.
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884203987329024/2885131781898240/STEM/7ddb8a70-4a94-420d-9bef-d6d4ea97ac01.png?resizew=387)
(1)求此时刻快车头A与慢车头C之间相距的单位长度?
(2)从此时刻开始,若快车AB以6个单位长度/秒的速度向右匀速继续行驶,同时慢车CD以2个单位长度/秒的速度向左匀速继续行驶,再行驶多少秒两列火车的车头A、C相距8个单位长度?
(3)在(2)中快车、慢车速度不变的情况下,此时在快车AB上有一位爱动脑筋的七年级学生乘客P,他发现行驶中有一段时间t秒钟内,他的位置P到两列火车头A,C的距离和加上到两列火车尾B,D的距离和是一个不变的值(即PA+PC+PB+PD为定值),请求出的t值及这个定值.
温馨提示:忽略两辆火车的车身及双铁轨的宽度.
![](https://img.xkw.com/dksih/QBM/2021/12/31/2884203987329024/2885131781898240/STEM/7ddb8a70-4a94-420d-9bef-d6d4ea97ac01.png?resizew=387)
(1)求此时刻快车头A与慢车头C之间相距的单位长度?
(2)从此时刻开始,若快车AB以6个单位长度/秒的速度向右匀速继续行驶,同时慢车CD以2个单位长度/秒的速度向左匀速继续行驶,再行驶多少秒两列火车的车头A、C相距8个单位长度?
(3)在(2)中快车、慢车速度不变的情况下,此时在快车AB上有一位爱动脑筋的七年级学生乘客P,他发现行驶中有一段时间t秒钟内,他的位置P到两列火车头A,C的距离和加上到两列火车尾B,D的距离和是一个不变的值(即PA+PC+PB+PD为定值),请求出的t值及这个定值.
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【推荐2】已知数轴上
两点相距
个单位长度,机器人从
点出发去
点,
点在
点右侧.规定向右为前进,第一次它前进
个单位长度,第二次它后退
个单位长度,第三次再前进
个单位长度,第四次又后退
个单位长度……按此规律行进,如果
点在数轴上表示的数为
,那么
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/e1fd7477-c0ed-430b-88e7-6d4c38e5c9b4.png?resizew=235)
(1)求出
点在数轴上表示的数.
(2)经过第七次行进后机器人到达点
,第八次行进后到达点
,点
到
点的距离相等吗?请说明理由.
(3)机器人在未到达
点之前,经过
次(
为正整数)行进后,它在数轴上表示的数应如何用含
的代数式表示?
(4)如果
点在原点的右侧,那么机器人经过
次行进后,它在
点的什么位置?请通过计算说明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa86faa9bfef703aead8c2606684dc5.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4fd4507c507c55250a3a59e738dce9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/e1fd7477-c0ed-430b-88e7-6d4c38e5c9b4.png?resizew=235)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)经过第七次行进后机器人到达点
![](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/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)机器人在未到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
(4)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9ba3f640f57c0cece089dfd19b4970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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名校
【推荐3】已知数轴上两点
、
对应的数分别为
、3,点P为数轴上一动点,其对应的数为
.
(1)若点
到点
、点
的距离相等,请直接写出点
对应的数是______;
(2)数轴上是否存在点
,使点到点
、点
的距离之和为6?若存在,请求出
的值;若不存在,说明理由;
(3)点
、点
分别以2个单位长度/分、1个单位长度/分的速度向右运动,同时点
以6个单位长度/分的速度从
点向左运动.当遇到
时,点
立即以同样的速度向右运动,并不停地往返于点
与点
之间,求当点
与点
重合时,直接写出点
所经过的总路程是 个单位长度.
![](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/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/2acb6cd7-7d4b-4131-8df5-4ec5b5f2edba.png?resizew=215)
(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)数轴上是否存在点
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)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/dad2a36927223bd70f426ba06aea4b45.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/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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,在数轴上点
对应的数为
,点
对应的数为8,点
对应的数为
为原点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/0cd19271-e860-4163-9999-8f5357fe9454.jpg?resizew=274)
(1)线段
的长是 ,线段
的中点所对应的数是
(2)若点
从点
出发,以每秒5个单位长度的速度沿数轴负方向运动,同时,点
从点
出发,以每秒3个单位长度的速度沿数轴正方向运动.设运动时间为
秒.
①用含
的式子表示点
点
表示的有理数;
②当点
到达点
时,求线段
的长;
③若线段
的长为5,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef63ad7b61f3fae0ac81148e7700ff.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/cea2199030727611406d9d1dfd6387c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/0cd19271-e860-4163-9999-8f5357fe9454.jpg?resizew=274)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若点
![](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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7a2860e8c926b556f5ba37b4f2e2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
③若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】同学们都知道,
表示
与
差的绝对值,实际上也可以理解为
与
在数轴上所对应的两个点之间的距离.利用数形结合思想回答下列问题:
(1)数轴上表示
和
两点之间的距离是______.
(2)
_____;若
,则
______.
(3)若
表示一个有理数,
的最小值为_______.
(4)已知数轴上两点
、
对应的数分别为
,
.现点
、点
分别以
个单位长度
秒和
单位长度
秒的速度同时向右,当点
与点
之间的距离为
个单位长度时,求点
所对应的数是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb754d8fd7928577d69587190c9962f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(1)数轴上表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf3d3564c61e5e9c39a9e2cf2de048b.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934ddeead25ea2a52d661cba28e30303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62b9daf36a078325c3393de2c733dd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9470d749e6635c49853c1fb94fbb12.png)
(4)已知数轴上两点
![](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/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec818fc0754296163206e1e8870f9e6.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】在平面直角坐标系
中,对于P,Q两点给出如下定义:若点P到x、y轴的距离中的最大值等于点Q到x、y轴的距离中的最大值,则称P,Q两点为“等距点”.下图中的
,
两点即为“等距点”.
(1)已知点A的坐标为
.
①在点
,
中,为点A的“等距点”的是点 ;
②若点D的坐标为
,且A,D两点为“等距点”,则点D的坐标为 ;
(2)若
,
两点为“等距点”,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847fea08d7cb36942bd5028b2cb7707e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e7b2a8b214f7aea0669f1f1932721f.png)
(1)已知点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2157b41548f02a86a438e63238719841.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba807aba93509588a99824cf24e2e64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10eba0e8e9ae3fb3967be44322c66d2.png)
②若点D的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9db70e60ecb9d1170159ba8940df531.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2758b912cc0a9b4d168acbfadf0d65f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4a40b37123ee674a39038a69f287d8.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在四边形
中,
,
,
,
,
,动点
从点
出发,以
的速度向
运动,动点
从点
出发,以
的速度向
运动,当其中一个点到达终点时,两点同时停止运动.
为何值时,四边形
是矩形?
(2)当
为何值时,
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee49e97546d466ba3ee630e08cdc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba3b7171748fc7d4dede1f5d3d3e79a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaec4275ae6515fb4db5abed97f7f499.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/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79789686104cab147c239d152271e076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8896ed0102f70210e9ba146f09ca0665.png)
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解答题-计算题
|
适中
(0.65)
【推荐2】如图,
是最小的正整数,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/5b1066f3-2321-42f8-8180-db267767da76.jpg?resizew=176)
(1)填空:
,
,
;
(2)在数轴上
,
所对应的点分别为
,
,点
为一动点,其对应的数为
,点
在
之间(不含
,
两点)运动时,请化简式子:
;
(3)在(1)(2)的条件下,点
,
,
开始在数轴上运动,若点
以每秒3个单位长度的速度向左运动,同时点
以每秒2个单位长度的速度向右运动,点
从原点开始以每秒
个单位长度的速度运动,运动时间为
秒,运动过程中,点
始终在
之间(不含
,
两点)运动,请问:是否存在
,使得
的值不随着时间
的变化而变化.若存在,请求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb5acb5fff02a0c2bc70b7e1760bc9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/5b1066f3-2321-42f8-8180-db267767da76.jpg?resizew=176)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)在数轴上
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/0b260933a44d7245acdf37d5811076f0.png)
(3)在(1)(2)的条件下,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/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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f16234d165597e355fb2ef83dcdb63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图,已知数轴上点A表示的数为8,B是数轴上位于点A左侧一点,且AB=20,
(1)写出数轴上点B表示的数 ;
(2)|5﹣3|表示5与3之差的绝对值,实际上也可理解为5与3两数在数轴上所对的两点之间的距离.如|x﹣3|的几何意义是数轴上表示有理数x的点与表示有理数3的点之间的距离.试探索:
①:若|x﹣8|=2,则x= .
②:|x+12|+|x﹣8|的最小值为 .
(3)动点P从O点出发,以每秒5个单位长度的速度沿数轴向右匀速运动,设运动时间为t(t>0)秒.求当t为多少秒时?A,P两点之间的距离为2;
(4)动点P,Q分别从O,B两点,同时出发,点P以每秒5个单位长度沿数轴向右匀速运动,Q点以P点速度的两倍,沿数轴向右匀速运动,设运动时间为t(t>0)秒.问当t为多少秒时?P,Q之间的距离为4.
(1)写出数轴上点B表示的数 ;
(2)|5﹣3|表示5与3之差的绝对值,实际上也可理解为5与3两数在数轴上所对的两点之间的距离.如|x﹣3|的几何意义是数轴上表示有理数x的点与表示有理数3的点之间的距离.试探索:
①:若|x﹣8|=2,则x= .
②:|x+12|+|x﹣8|的最小值为 .
(3)动点P从O点出发,以每秒5个单位长度的速度沿数轴向右匀速运动,设运动时间为t(t>0)秒.求当t为多少秒时?A,P两点之间的距离为2;
(4)动点P,Q分别从O,B两点,同时出发,点P以每秒5个单位长度沿数轴向右匀速运动,Q点以P点速度的两倍,沿数轴向右匀速运动,设运动时间为t(t>0)秒.问当t为多少秒时?P,Q之间的距离为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/10/ed27e8bd-f66a-4fa5-849c-b1816b2da8cf.png?resizew=265)
您最近一年使用:0次