如图,在数轴上
点表示的数
,
点表示的数
,
点表示的数
,
是最大的负整数,且
满足
.
![](https://img.xkw.com/dksih/QBM/2019/9/26/2299083748786176/2302520702877696/STEM/c5eb4571cc284230adb8eba98baf6a63.png?resizew=218)
(1)求
,
,
的值;
(2)若将数轴折叠,使得
点与
点重合,求与
点重合的点对应的数;
(3)点
,
,
在数轴上同时开始运动,其中
以
单位每秒的速度向左运动,
以
单位每秒的速度向左运动,点
以
单位每秒的速度运动,当
,
相遇时,
停止运动,求此时
两点之间的距离.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cda097a4e7c41100e573d8304ee066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af4561305492db282ae625ecd4528fa.png)
![](https://img.xkw.com/dksih/QBM/2019/9/26/2299083748786176/2302520702877696/STEM/c5eb4571cc284230adb8eba98baf6a63.png?resizew=218)
(1)求
![](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/071a7e733d466949ac935b4b8ee8d183.png)
(2)若将数轴折叠,使得
![](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)
(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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
更新时间:2019-10-01 12:33:16
|
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解答题-问答题
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较难
(0.4)
【推荐1】如图:已知,在数轴上A点表示数a,B点示数b,C点表示数c,且a、b、c满足.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/19/34ab1ae6-fa81-42eb-b45b-25d276c49d45.png?resizew=249)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)点A、B、C开始在数轴上运动,若点A以每秒1个单位长度的速度向左运动,同时,点B和点C分别以每秒4个单位长度和2个单位长度的速度向右运动.假设t秒钟
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07eabb3ff92cc5e071c48df759e64ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d928cd20fe56876f2b7e77780ef02e28.png)
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【推荐2】已知数轴上A,B两点对应的数分别为-2和8,P为数轴上一点,对应的数为x.
(1)线段PA的长度可表示为_________(用含
的式子表示);
(2)在数轴上是否存在点P,使得PA-PB=6?若存在,求出x的值;若不存在,请说明理由;
(3)当P为线段AB的中点时,点A,B,P同时开始在数轴上分别以每秒3个单位长度,每秒2个单位长度,每秒1个单位长度沿数轴正方向运动,试问经过几秒,PB=2PA?
(1)线段PA的长度可表示为_________(用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在数轴上是否存在点P,使得PA-PB=6?若存在,求出x的值;若不存在,请说明理由;
(3)当P为线段AB的中点时,点A,B,P同时开始在数轴上分别以每秒3个单位长度,每秒2个单位长度,每秒1个单位长度沿数轴正方向运动,试问经过几秒,PB=2PA?
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解答题-问答题
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较难
(0.4)
【推荐3】如图,已知数轴上原点为O,点B表示的数为﹣3,A在B的右边,且A与B的距离是10.动点P从点B出发,以每秒2个单位长度的速度沿数轴向右匀速运动,同时动点Q从点A出发,以每秒3个单位长度的速度沿数轴向左匀速运动,设运动时间为t(t>0)秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/78d91e72-30a7-4053-abf7-7c89fcba2b18.png?resizew=251)
(1)点A表示的数是 ,点P表示的数是 (用含t的代数式表示),点Q表示的数是 (用含t的代数式表示);
(2)是否存在某一时刻t,使点P与点Q到点O的距离相等?若存在,求出t的值;若不存在,请说明理由;
(3)当t为何值时,点P与点Q之间的距离为5?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/78d91e72-30a7-4053-abf7-7c89fcba2b18.png?resizew=251)
(1)点A表示的数是 ,点P表示的数是 (用含t的代数式表示),点Q表示的数是 (用含t的代数式表示);
(2)是否存在某一时刻t,使点P与点Q到点O的距离相等?若存在,求出t的值;若不存在,请说明理由;
(3)当t为何值时,点P与点Q之间的距离为5?
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