在数轴上,动点A从原点O出发向负半轴匀速运动,同时动点B从原点O出发向正半轴匀速运动,动点B的速度是动点A的速度的两倍,经过5秒后A、B两点间的距离为15个单位长度,
(1)直接写出动点B的运动速度;
(2)若5秒后,动点A立即开始以原来的速度大小向正半轴运动,动点B继续按照原来的方式运动,问再经过多长时间OB=3OA(其中OB表示点B到原点的距离,OA表示点A到原点的距离)?
(1)直接写出动点B的运动速度;
(2)若5秒后,动点A立即开始以原来的速度大小向正半轴运动,动点B继续按照原来的方式运动,问再经过多长时间OB=3OA(其中OB表示点B到原点的距离,OA表示点A到原点的距离)?
18-19七年级·北京海淀·阶段练习 查看更多[3]
北京市海淀区师达中学2018-2019学年七年级(上)月考数学试题上海市崇明区部分学校联考(五四制)2023-2024学年六年级下学期期中数学试题(已下线)考点清单02一次方程(组)和一次不等式(组)(知识导图+11个考点清单&题型解读)-2023-2024学年六年级数学下学期期末考点大串讲(沪教版)
更新时间:2019-06-04 09:58:43
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【知识点】 几何问题(一元一次方程的应用)解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在长方形
中,
,
.动点P从点A出发,沿线段
,
向点C运动,速度为
;动点Q从点B出发,沿线段
,
向点D运动,速度为
.动点P,Q同时出发,设运动的时间是
.
(1)请用含t的代数式表示下列线段的长度:
如图1,点P在
上运动,
______,
如图2,点P在
上运动,
______;
(2)如图1,点P在
上运动.
①当t为何值时,
,
②当t为何值时,
等于长方形
周长的
;
(3)如图2,点P在
上运动.
当t为何值时,
等于
的一半.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ecd76012d1b9c5e9fec6221e6e489c2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/5d950d45-b254-4384-82cc-e4ed20eb4e23.jpg?resizew=323)
(1)请用含t的代数式表示下列线段的长度:
如图1,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
如图2,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
(2)如图1,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0028d73e6f8a861ea5f97ef287367aa.png)
②当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68382ff66094cacf36aa3ee978dd6930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(3)如图2,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
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【推荐2】(1)如图1:正方形
边长为6,点P、点Q在正方形的边上.点P从点A以每秒3个单位长度的速度沿
折线循环运动,同时点Q从点C以每秒1个单位长度的速度沿
折线循环运动. 设点 P 运动时间为x秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/31b18f47-3e63-429d-9743-8cd89f2ef592.png?resizew=119)
①当点P在
上运动时,
,当点Q在
运动时
(用含 x 的代数式表示);
②当x为何值时,点P和点Q第一次相遇.
(2)如图2 :
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/36501aef-bf97-4367-b45a-143df4115651.png?resizew=168)
长为8,宽为4的长方形
,点E为边
的中点,点M从点A以每秒2个单位长度的速度沿
折线运动,到达点C停止.设点M运动时间为t秒,当三角形
的面积等于8时,请求出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8e962e422c964ba4a6007a101f1536.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7772cae304a8ba3b227244b23aab8cdf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/31b18f47-3e63-429d-9743-8cd89f2ef592.png?resizew=119)
①当点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5745e2dc1d5308872c68ae932cd13ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1772209a569f87d0539b5d7871d0834.png)
②当x为何值时,点P和点Q第一次相遇.
(2)如图2 :
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/36501aef-bf97-4367-b45a-143df4115651.png?resizew=168)
长为8,宽为4的长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd66776565f049eb453c14fcaf79234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d4a244bd6c29b79ddbf0bbdaf6cd14.png)
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名校
【推荐3】如图,数轴上有
、
、
三个点,分别表示数
、
、
,有两条动线段
和
点
与点
重合,点
与点
重合,且点
总在点
的左边,点
总在点
的左边
,
,
,线段
以每秒
个单位的速度从点
开始一直向右匀速运动,同时线段
以每秒
个单位的速度从点
开始向右匀速运动.当点
运动到点
时,线段
立即以相同的速度返回;当点
运动到点
时,线段
、
立即同时停止运动.设运动时间为
秒
整个运动过程中,线段
和
保持长度不变
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/faaf321b-78fe-4c69-b229-790448fdd240.png?resizew=485)
(1)当
时,点
表示的数为______,点
表示的数为______.
(2)当开始运动后,
______秒时,点
和点
重合.
(3)在整个运动过程中,求点
和点
重合时
的值.
(4)在整个运动过程中,当线段
和
重合部分长度为
时,请直接写出此时
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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4fd4507c507c55250a3a59e738dce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df41c4d9e31986006fad687fe3b5925.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/acc290b44635265137fdf13146b6a6d9.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/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d14c6959273338a048b023805cce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6609cc372831939ad4beb3770b0b0ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/faaf321b-78fe-4c69-b229-790448fdd240.png?resizew=485)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)当开始运动后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)在整个运动过程中,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)在整个运动过程中,当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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