阅读材料:我们知道|x|的几何意义是在数轴上的数x对应的点与原点的距离;即
,这个结论我们可以推广到数轴上任意两点之间的距离,如图,若数轴上两点A、B分别对应有理数a、b,则A、B两点之间的距离为
.
根据阅读材料,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/3ed71810-a4a2-4235-bdf3-0b9e7cd4afd5.png?resizew=194)
(1)数轴上表示2和
的两点之间的距离是______;
(2)数轴上表示x和
的两点A、B间的距离是_____,若
,则x_____;
(3)求
的最大值,并求出x的取值范围;
(4)互不相等的有理数a、b、c在数轴上的对应点分别为A、B、C.若
,请分析判断在点A、B、C中哪个点居于另外两点之间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6592a23ca3aa78aca763fd080af7c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019825f7b7bfc8aa59715cf21f3cf47f.png)
根据阅读材料,回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/3ed71810-a4a2-4235-bdf3-0b9e7cd4afd5.png?resizew=194)
(1)数轴上表示2和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
(2)数轴上表示x和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87092dbd4d72c2446a6f7fa3d4642f03.png)
(4)互不相等的有理数a、b、c在数轴上的对应点分别为A、B、C.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e73ed60fcd5da799701592e8dd70d0.png)
更新时间:2024-02-15 17:18:51
|
相似题推荐
解答题-问答题
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【推荐1】“数形结合”是重要的数学思想.如:
表示3与
差的绝对值,实际上也可以理解为3与
在数轴上所对应的两个点之间的距离.进一步地,数轴上两个点A,B所对应的数分别用a,b表示,那么A,B两点之间的距离表示为
.利用此结论,回答以下问题:
和5这两点之间的距离为 .
(2)若x表示一个实数,
的最小值为 .
(3)直接写出所有符合条件的x,使得
,则x的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb754d8fd7928577d69587190c9962f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/019825f7b7bfc8aa59715cf21f3cf47f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
(2)若x表示一个实数,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c46f11f3c0c43823ded43dced366864.png)
(3)直接写出所有符合条件的x,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c68434dce5019401fe70ec05c35b0b.png)
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【推荐2】如图,线段AB=28,点P、Q分别从A、B两点同时出发,在直线AB上运动,它们的速度分别为2个单位/s、4个单位/s,设运动时间为t.
(1)如果P、Q两点在线段AB之间相向运动,当它们相遇时,求t的值;
(2)如果P、Q两点都向左运动,当点Q追上点P时,求线段AP的长;
(3)如果线段AB在数轴上,点A表示的数为﹣12,点P、Q在线段AB之间相向运动,当PQ=8时,求P点对应的数.
(1)如果P、Q两点在线段AB之间相向运动,当它们相遇时,求t的值;
(2)如果P、Q两点都向左运动,当点Q追上点P时,求线段AP的长;
(3)如果线段AB在数轴上,点A表示的数为﹣12,点P、Q在线段AB之间相向运动,当PQ=8时,求P点对应的数.
![](https://img.xkw.com/dksih/QBM/2022/1/2/2885545661472768/2885879711703040/STEM/e00c6dba-bf40-4571-b499-0866c6b9b692.png?resizew=375)
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【推荐1】在如图所示的数轴上表示﹣
的倒数、绝对值等于1的数、﹣2的立方,并用“<”把它们连接起来.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/13/a9ccd066-1309-42a2-a298-cb3032e04ee0.png?resizew=321)
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解答题-计算题
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【推荐2】如图,数轴上从左到右排列的
,
,
三点的位置如图所示.点
表示的数是3,
和
两点间的距离为8,
和
两点间的距离为4.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/479f33f9-4ce3-4696-aa84-cc7f76da1b0d.png?resizew=236)
(1)求
,
两点分别表示的数;
(2)若动点
从点
出发,以每秒2个单位长度的速度向右运动,运动时间为
秒.
①当点
运动到与点
和点
的距离相等时,求
的值;
②若同时,有
,
两动点分别从点
,
同时出发,都以每秒1个单位长度的速度沿着数轴向左运动,把点
与点
之间的距离表示为
,点
与点
之间的距离表示为
,当
取最小值时,求
的最大值和最小值.
![](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/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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/479f33f9-4ce3-4696-aa84-cc7f76da1b0d.png?resizew=236)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若动点
![](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/36a1b09c653185842513e24ebba60bb3.png)
①当点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②若同时,有
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐1】如图:已知∠MON=90°,射线OA绕点O从射线OM位置开始按顺时针方向以每秒4°的速度旋转,同时射线OB绕点O从射线ON位置开始按逆时针方向以每秒6°的速度旋转,设旋转时间为t秒(0≤t≤30).
(1)用含t的代数式表示∠MOA的度数;
(2)在运动过程中,当∠AOB第二次达到60°时,求t的值;
(3)射线OA,OB在旋转过程中是否存在这样的t,使得射线OB是由射线OM,射线OA,射线ON中的其中两条组成的角(指大于0°而不超过180°的角)的平分线?如果存在,请直接写出t的值;如果不存在,请说明理由.
(1)用含t的代数式表示∠MOA的度数;
(2)在运动过程中,当∠AOB第二次达到60°时,求t的值;
(3)射线OA,OB在旋转过程中是否存在这样的t,使得射线OB是由射线OM,射线OA,射线ON中的其中两条组成的角(指大于0°而不超过180°的角)的平分线?如果存在,请直接写出t的值;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182829483450368/2183813830393856/STEM/29b1bca82a0940119b858fe8937f09f2.png?resizew=507)
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【推荐2】如图
,四边形
中,
,
.
(1)动点
从
出发,以每秒
个单位的速度沿路线
运动到点
停止.设运动时间为
,
的面积为
,
关于
的函数图象如图
所示,求
、
的长.
(2)如图
,动点
从点
出发,以每秒
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
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,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/25/47d3276c-0e9c-43ae-962a-306c8633214c.png?resizew=657)
(1)动点
![](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/bdaa19de263700a15fcf213d64a8cd57.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/0a6936d370d6a238a608ca56f87198de.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.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/61128ab996360a038e6e64d82fcba004.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/d91e07104b699c4012be2d26160976a2.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e87b2f781cafa7989d81f9bf8c42b150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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