如图,已知数轴上有三个点A、O、B,其中A表示的数为
,B表示的数为2,点M为数轴上任意一点
![](https://img.xkw.com/dksih/QBM/2023/12/5/3382747466760192/3388858900643840/STEM/88718da39ba2474989c78f9e97f3fe48.png?resizew=267)
(1)如果点M到点A、点B的距离相等,则
______;
(2)若数轴上存在点M,使点M到点A、点B的距离之和是7,则x的值为多少?
(3)若A、B两点间的线段称为“陇海线”(包含A、B两点),点M以每秒3个单位的速度从点O向左运动时,点A以每秒1个单位的速度向左运动,点B以每秒4个单位的速度向左运动,且三点同时出发,请你直接写出几秒钟后点M能把陇海线分成长度相等的两部分?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dbf80cb71406fd14621139149f7ed9e.png)
![](https://img.xkw.com/dksih/QBM/2023/12/5/3382747466760192/3388858900643840/STEM/88718da39ba2474989c78f9e97f3fe48.png?resizew=267)
(1)如果点M到点A、点B的距离相等,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e4d2bcf4cdaab2a07ddf3640bb7ffa.png)
(2)若数轴上存在点M,使点M到点A、点B的距离之和是7,则x的值为多少?
(3)若A、B两点间的线段称为“陇海线”(包含A、B两点),点M以每秒3个单位的速度从点O向左运动时,点A以每秒1个单位的速度向左运动,点B以每秒4个单位的速度向左运动,且三点同时出发,请你直接写出几秒钟后点M能把陇海线分成长度相等的两部分?
更新时间:2023-12-14 22:19:54
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解答题-应用题
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【推荐1】邮递员骑车从邮局出发,先向西骑行3
到达A村,继续向西骑行2
到达B村,然后向东骑行8
到达C村,最后回到邮局.
(1)以邮局为原点,以向东方向为正方向,以1个单位表示1
,在该数轴上表示A,B,C三个村庄的位置;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/92e6b3b2-bdd6-4af5-a920-ee95b971199e.png?resizew=254)
(2)C村离A村有多远?
(3)邮递员一共骑行了多少千米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
(1)以邮局为原点,以向东方向为正方向,以1个单位表示1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fe30c67ac20cd4e8b9cc2d0d420a7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/92e6b3b2-bdd6-4af5-a920-ee95b971199e.png?resizew=254)
(2)C村离A村有多远?
(3)邮递员一共骑行了多少千米?
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【推荐2】多项式﹣5x2y﹣2xy+3的三次项系数、二次项系数和常数项在数轴上分别对应A、B、C三个点,请回答下列各题:
(1)A、B、C这三个点表示的数分别是 , , ,请在数轴上标出来.
(2)A、B两点间的距离是 ,A、C两点间的距离是 .
(3)若点C每秒沿数轴向左移动2个单位长度,1.5秒钟时到达的点表示的数是 ,t秒钟时到达的点表示的数是 .
(1)A、B、C这三个点表示的数分别是 , , ,请在数轴上标出来.
(2)A、B两点间的距离是 ,A、C两点间的距离是 .
(3)若点C每秒沿数轴向左移动2个单位长度,1.5秒钟时到达的点表示的数是 ,t秒钟时到达的点表示的数是 .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/abef9336-86c3-4dae-a02f-6d5d5b1ba0fd.png?resizew=339)
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【推荐1】我国著名数学家华罗庚曾说过:“数缺形时少直观,形少数时难入微;数形结合百般好,隔离分家万事休”.数学中,数和形是两个最主要的研究对象,它们之间有着十分密切的联系.数形结合是解决数学问题的重要思想方法.如图,数轴上A,B两点对应的有理数分别为
和
,点P从点O出发,以每秒1个单位长度的速度沿数轴正方向匀速运动,点Q同时从点A出发,以每秒2个单位长度的速度沿数轴正方向匀速运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/26ae95a6-19c8-4106-96b1-4173240fc519.png?resizew=173)
(1)分别求当
及
时,对应的线段
的长度;
(2)当
时,求所有符合条件的t的值,并求出此时点Q所对应的数;
(3)若点P一直沿数轴的正方向运动,点Q运动到点B时,立即改变运动方向,沿数轴的负方向运动,到达点A时,随即停止运动,在点Q的整个运动过程中,是否存在合适的t值,使得
?若存在,求出所有符合条件的t值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/26ae95a6-19c8-4106-96b1-4173240fc519.png?resizew=173)
(1)分别求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/932848ffae6b9a71705ef6792b93aefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538d6bc97ebe02f2f7572bc9ab5c2c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad27e15b394f53f5aad17267ed8e9ebc.png)
(3)若点P一直沿数轴的正方向运动,点Q运动到点B时,立即改变运动方向,沿数轴的负方向运动,到达点A时,随即停止运动,在点Q的整个运动过程中,是否存在合适的t值,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970c3fbc10a16a4fb012851d6def9f26.png)
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【推荐2】已知数轴上有
两个点.
(1)如图1,若
,
是
的中点,
为线段
上的一点,且
,则
=_______,
=_______,
=_______(用含
的代数式表示);
(2)如图2,若
三点对应的数分别为
,
,
.
①当
两点同时向左运动,同时
点向右运动,已知点
的速度分别为8个单位长度/秒、4个单位长度/秒、2个单位长度/秒,点M为线段
的中点,点N为线段
的中点,求运动3秒以后线段
的长.
②现有动点
都从
点出发,点P以每秒1个单位长度的速度向终点
移动;当点P移动到B点时,点Q才从
点出发,并以每秒3个单位长度的速度向左移动,且当点P到达
点时,点Q也停止移动(若设点P的运动时间为t).当
两点间的距离恰为18个单位时,则时间t的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e688420b72b3fa63fd81f679a86204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/46b70c33-185e-4241-90d1-af62305c98c5.png?resizew=525)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ab66291ef17f0d1664cefd6f6bffd31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e22e1223baf7cb3d53e668c2449609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.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/411461db15ee8086332c531e086c40c7.png)
②现有动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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【推荐1】定义:如图1,射线
在
的内部,图中共有3个角:
和
,若其中有一个角的度数是另一个角度数的两倍,则称射线
是
的“妙分线”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/12cfd5a7-ecec-481b-90b3-d1f831a2754e.png?resizew=274)
(1)如图1,若
,且射线
是
的“妙分线”,求
的度数.
(2)如图2,若
,射线
绕点P从
位置开始,以每秒
的速度顺时针旋转,同时,射线
绕点
以每秒
的速度顺时针旋转,当
与
成
时,射线
,射线
同时停止旋转,设旋转的时间为
秒,求
为何值时,射线
是
的“妙分线”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29cd961a2e521fc3fbfb7ded70b176f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/12cfd5a7-ecec-481b-90b3-d1f831a2754e.png?resizew=274)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e0eca7da89ba07877ec3d1cb33e138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933832c45503df7c8617c904853bdb61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b4acddf579a77ac63e095936fe66c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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【推荐2】如图①,四边形
中,
,
.动点
从
出发,以每秒1个单位的速度沿路线
运动到
停止.设运动时间为
,
的面积为
,
关于
的函数图象如图②所示.
(1)结合图①和图②可知,
__________,
__________;
(2)①当点
在线段
上运动时,请写出
与
的关系式(并写明自变量的取值范围);
②当
时,
等于多少?
(3)如图③,动点
从点
出发,以每秒2个单位的速度沿路线
运动到点
停止,同时,动点
从点
出发,以每秒5个单位的速度沿路线
运动到点
停止,设运动时间为
,当
点运动到
边上时,连接
、
、
,当
的面积为
时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4853b4705dee3de86e18a346ee3ae853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/baba65c3-6de8-4993-a563-9c39932d2337.png?resizew=394)
(1)结合图①和图②可知,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
(2)①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8564cc22fc0687cd91dba324194885a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图③,动点
![](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/3087da5c11909dab613378fee8d471fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/1d311b8b003421d42aa6a3673d1e0baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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