阅读思考:
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/0be895dd23744e949efd6162d2b72bc8.png?resizew=259)
小明在学习过程中,发现“数轴上两点间的距离”可以用“表示这两点数的差”来表示,如图1所示,线段
,
,
的长度可表示为:
;
BC=5=4-(-1);
;
于是他归纳出这样的结论:如果点
表示的数为
,点
表示的数为
,当
时,
(较大数-较小数).
(1)尝试应用:
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/6b62fb162afb4b03b8813d12d861c6cf.png?resizew=257)
①如图2所示,计算:
______,
______;
②把一条数轴在数
处对折,使表示-20和2020两数的点恰好互相重合,则
=______;
(2)问题解决:
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/f1186ffd88b14ea3957a33f8f295ef79.png?resizew=251)
①如图3所示,点
表示数
,点
表示数-2,点
表示数
,且
,求出点
和点
分别表示的数;
②在上述①的条件下,是否存在点
,使
?若存在,求出点
所表示的数;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/0be895dd23744e949efd6162d2b72bc8.png?resizew=259)
小明在学习过程中,发现“数轴上两点间的距离”可以用“表示这两点数的差”来表示,如图1所示,线段
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c662bd1f7b7a4c2652b002443a5376.png)
BC=5=4-(-1);
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98fd0712227a6317fdca1027a6b9d7.png)
于是他归纳出这样的结论:如果点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8845c0d06613fabb0358d5392cca38b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7819f6e7447bbe91baac7eb439940d72.png)
(1)尝试应用:
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/6b62fb162afb4b03b8813d12d861c6cf.png?resizew=257)
①如图2所示,计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a903538428f3dea2713fe721ce4f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
②把一条数轴在数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)问题解决:
![](https://img.xkw.com/dksih/QBM/2020/12/11/2611631440601088/2621355274461184/STEM/f1186ffd88b14ea3957a33f8f295ef79.png?resizew=251)
①如图3所示,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/3fb1c22a97858a59075755a260c4800c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a9c34909b6b6b5296500a3fc5b0afde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
②在上述①的条件下,是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234dd741f4aefdd04a4f887e8d59d0a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
更新时间:2020-12-24 23:43:52
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,
是数轴上的两点,点
是原点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/d5304097-de63-4035-8d08-2825a05e19a1.png?resizew=295)
(1)写出数轴上点
和点
表示的数.
(2)点
和
分别从点
同时出发,点
以每秒1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,求何时
相距4个单位长度?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d683547acb9ad2ea9965322147ed03b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/d5304097-de63-4035-8d08-2825a05e19a1.png?resizew=295)
(1)写出数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)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/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/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,甲、乙两人(看成点)分别在数轴
和5的位置上,沿数轴做移动游戏.每次移动游戏规则:裁判先捂住一枚硬币,再让两人猜向上一面是正是反,而后根据所猜结果进行移动.
①若都对或都错,则甲向东移动1个单位,同时乙向西移动1个单位;
②若甲对乙错,则甲向东移动4个单位,同时乙向东移动2个单位;
③若甲错乙对,则甲向西移动2个单位,同时乙向西移动4个单位.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/4547a8af-f841-4f34-a4f8-5fa764db0853.png?resizew=289)
(1)目前甲乙两人距离_________个单位.
(2)若两人连续每次都对或都错,经过__________次移动,甲乙相遇,此时甲乙所在位置读数为_________.
(3)从图的位置开始,若完成了
次移动游戏,发现甲每次都对,乙每次所猜结果都错,求甲乙相遇时
值以及此时对应位置读数.
(4)从图的位置开始,若进行了
次移动游戏后,甲与乙的位置相距4个单位,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
①若都对或都错,则甲向东移动1个单位,同时乙向西移动1个单位;
②若甲对乙错,则甲向东移动4个单位,同时乙向东移动2个单位;
③若甲错乙对,则甲向西移动2个单位,同时乙向西移动4个单位.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/4547a8af-f841-4f34-a4f8-5fa764db0853.png?resizew=289)
(1)目前甲乙两人距离_________个单位.
(2)若两人连续每次都对或都错,经过__________次移动,甲乙相遇,此时甲乙所在位置读数为_________.
(3)从图的位置开始,若完成了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(4)从图的位置开始,若进行了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,点
、
在线段
上,且
,点
是线段
的中点,点
是线段
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/9b7439b2-78b0-4c6f-92b9-f3ed462d5417.png?resizew=305)
(1)若
,点
是线段
的中点,求
的长;
(2)若
,点
是线段
的三等分点,且满足
.求
的长.(用含
的式子表示)
![](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/bf4c7f14feffce0781c46e6c15b0f910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/9b7439b2-78b0-4c6f-92b9-f3ed462d5417.png?resizew=305)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3194539643760df129d5ebb652addf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88250576ff7428d193b725e86401b16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2079de6c024303e01987270c8b195bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,数轴上A、B、C三点对应的有理数分别为10、15和
.若点P从点A出发,以每秒1个单位长度的速度沿数轴正方向运动,点Q同时从原点O出发,以每秒2个单位长度的速度沿数轴正方向运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107447235379200/3147785609240576/STEM/fa2660586fdd4a2d83bbb986a789eb08.png?resizew=335)
(1)探究:
①
的长度为 个单位长;
的长度为 个单位长.
②若数轴上有M、N两点,对应的有理数为x、y,且
,则
的长度为 个单位长(用x、y的式子表示).
(2)应用:
①当
时,用含t的式子填空:
个单位长,
个单位长;
②当
时,求
的值;
(3)拓展:当P、Q两点距离为4个单位长度时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13ce3ebd1112220c639562739f1f9d1.png)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107447235379200/3147785609240576/STEM/fa2660586fdd4a2d83bbb986a789eb08.png?resizew=335)
(1)探究:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②若数轴上有M、N两点,对应的有理数为x、y,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0086b15b30b83d428b35cdbe094810f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)应用:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c104d9088486ac1a7072482d2167aa52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbc9c4e4db6374d5ba4c5dec8747442.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(3)拓展:当P、Q两点距离为4个单位长度时,求t的值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图是某新房的平面结构图(图中长度单位:米),其中每间房屋地面都是长方形,房东准备在客厅和卧室地面全部铺设木地板,厨房和卫生间地面全部铺设陶瓷地板,根据图中数据解决以下问题:
(1)该房屋客厅和卧室的地面面积和为_________平方米;该房屋厨房和卫生间的地面面积和为_________平方米;(用含x的代数式表示)
(2)当
时,若木地板的单价是
元,木地板的单价是陶瓷地板的单价的
,房间全部铺完预计需要花费3600元,其中包含人工费450元.问木地板和陶瓷地板的单价分别是多少元?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/22/1f94e99b-b430-4f8f-a3ab-63a89de24303.jpg?resizew=230)
(1)该房屋客厅和卧室的地面面积和为_________平方米;该房屋厨房和卫生间的地面面积和为_________平方米;(用含x的代数式表示)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
您最近一年使用:0次