如图,数轴上从左到右依次有
、
、
、
四个点,
、
之间的距离为
,
、
之间的距离为
,
、
之间的距离为
,将直径为
的圆形纸片按如图所示的方式放置在点
处,并沿数轴水平方向向右滚动.
![](https://img.xkw.com/dksih/QBM/2023/10/31/3357904886480896/3358127811379200/STEM/40996611d88b4161b16695a5230b6b77.png?resizew=453)
(1)若圆形纸片从点
处滚到点
处,恰好滚动了
为正整数
圈,则
(用含
的代数式表示
,
是 (填“有理数”或“无理数”);
(2)若圆形纸片从点
处滚动
圈后,恰好到达点
处,求
、
之间的距离
结果保留
;
(3)若点
表示的数为
,圆形纸片从点
处滚动到点
、
、
处的圈数均为整数,其中圆形纸片从点
处滚动
圈后,恰好到达点
处,求点
表示的数.
![](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/8455657dde27aabe6adb7b188e031c11.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/704f858f73063183e5779257900e694d.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/4b8ce4747847e3da9b9d8cf23430b408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6356f9c5af98461c600b47801b869178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2023/10/31/3357904886480896/3358127811379200/STEM/40996611d88b4161b16695a5230b6b77.png?resizew=453)
(1)若圆形纸片从点
![](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/f8d60c875d41a8e3de3251874cd4949a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277696e8d9f58c9ec28887783b317e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若圆形纸片从点
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b578347f1189feaa0c20e2f65e5ec8.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
23-24七年级上·江苏·周测 查看更多[2]
更新时间:2023-10-31 22:31:26
|
相似题推荐
解答题-计算题
|
较难
(0.4)
【推荐1】点A在数轴上对应的数为
,点
对应的数为
,且
,
满足
.
(1)求线段
的长;
(2)若点
向右运动,速度为
单位长度
秒,点
向左运动,速度为
单位长度
秒,点
,
和
三点同时开始运动,点
先向右运动,遇到点
后立即掉头向左运动,遇到点
再立即掉头向右运动,如此往返,当
,
两点相距
个单位长度时,点
立即停止运动,求此时点
移动的路程为多少个单位长度?
(3)点E在数轴上对应的数为
,点
与点
重合,线段
以每秒
个单位长度的速度向左运动,同时点
从点
左侧某处以每秒
个单位长度的速度向右运动,点
是线段
的中点,点
与点
相遇
秒后与点
相遇.若在整个运动过程中,
恒成立:求
与
的值.
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab90e3d9fc309d35ddecc8c8adc37ab3.png)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点
![](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/4333bb203d02814c146ed587b69ea69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4333bb203d02814c146ed587b69ea69d.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/dad2a36927223bd70f426ba06aea4b45.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.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/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)点E在数轴上对应的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3791dafaf51f1a3b5ebc14baf63098b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐2】已知
,
,
为数轴上三点,若点
到点
的距离是点
到点
的距离的2倍,我们就称点
是
的友好点.例如,如图①,点
表示的数为
,点
表示的数为2,表示数1的点
到点
的距离是2,到点
的距离是1,那么点
是
的友好点;又如,表示数0的点
到点
的距离是1,到点
的距离是2,那么点
就不是
的友好点,但点
是
的友好点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/a5c8f6fb-60ca-417a-9da0-9a175fdf53e9.png?resizew=575)
知识运用:
(1)如图②,
,
为数轴上两点,点
所表示的数为
,点
所表示的数为4.
①在点
和点
中间,数______所对应的点是
的有好点;
②在数轴上,数______和数______所对应的点都是
的友好点.
(2)如图③,
,
为数轴上两点,点
所表示的数为
,点
所表示的数为40.现有一只电子蚂蚁
从点
出发,以每秒2个单位长度的速度向左运动,到达点
停止,当点
的运动时间
为何值时,点
,
和
中恰有一个点为其余两点的友好点?
![](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/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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e82db0c7d2c362cf4a70027aaa19be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e82db0c7d2c362cf4a70027aaa19be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e82db0c7d2c362cf4a70027aaa19be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fc5eea070926e164331a5b76076e9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/a5c8f6fb-60ca-417a-9da0-9a175fdf53e9.png?resizew=575)
知识运用:
(1)如图②,
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①在点
![](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/85c9635c58e5df20634af8f685475809.png)
②在数轴上,数______和数______所对应的点都是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17636259a23b46606c57c4eb601d31d4.png)
(2)如图③,
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ef63ad7b61f3fae0ac81148e7700ff.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.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/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐3】如图(1),在数轴上,点A表示的数为2,点B表示的数为6,点C为数轴上原点左侧一点,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/9914ca73-a253-4a88-b74c-9941a4a4182f.png?resizew=517)
(1)点C表示的数是________;线段
的长度是________;
(2)如图(1),动点P从点A出发,沿数轴向右运动且初始速度为1个单位/秒,到达B点后以2倍的初始速度返回点A;在点P出发的同时,动点Q从点C出发,沿数轴向右运动,在运动的过程中速度保持不变为3个单位/秒,当点P返回点A时P、Q两点同时停止运动;设运动的时间为t秒,当
时,求此时动点P在数轴上所对应的数;
(3)如图(2),
,数轴上方有一个正方形
,动点M沿A-E-D-B-A的顺序以2个单位/秒的速度匀速绕正方形运动一周,再回到A点时停止运动;在点C的正上方8个单位长度处有一点G,三角形
为直角三角形;设运动的时间为m秒,当点M在线段
上时,三角形
的面积等于________;当点M在线段
上时,三角形
的面积等于________;当点M在线段
上时,三角形
的面积等于________:当点M在线段
上时,三角形
的面积等于________(用含m的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/9914ca73-a253-4a88-b74c-9941a4a4182f.png?resizew=517)
(1)点C表示的数是________;线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图(1),动点P从点A出发,沿数轴向右运动且初始速度为1个单位/秒,到达B点后以2倍的初始速度返回点A;在点P出发的同时,动点Q从点C出发,沿数轴向右运动,在运动的过程中速度保持不变为3个单位/秒,当点P返回点A时P、Q两点同时停止运动;设运动的时间为t秒,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9470964f0f18a5d71e6b5937d93e035.png)
(3)如图(2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4982bdbeb295651557a71800f567444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c288e6de7e470011569e2b7f870779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1c74dd7c33bbc1f73efad7883fa46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1c74dd7c33bbc1f73efad7883fa46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1c74dd7c33bbc1f73efad7883fa46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1c74dd7c33bbc1f73efad7883fa46.png)
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【推荐1】【背景知识】
通过研究数轴,发现数轴可以将数与形完美结合.经过深入探究,可以得到以下结论:
若数轴上点A,B表示的数分别为a,b,则A,B两点之间的距离
,线段AB的中点表示的数为
.(注:解答下面问题时,直接应用本结论)
【问题情境】
若
,
.则A,B两点间的距离
______,线段
的中点表示的数为______.
【问题探究】
点P从点A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,点Q从点B出发,以每秒1个单位长度的速度向左匀速运动.设运动时间为t秒.
(1)t秒后,点P表示的数为______,点Q表示的数为______;
(2)当
两点之间的距离是2,求运动时间t.
【深入思考】
若M为
的中点,N为
的中点,在点P运动过程中,M,N两点之间的距离是否发生变化?若变化,请说明理由;若不变,请求出M,N两点之间的距离.
通过研究数轴,发现数轴可以将数与形完美结合.经过深入探究,可以得到以下结论:
若数轴上点A,B表示的数分别为a,b,则A,B两点之间的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c45b1c50349cb0e320dd627e2094d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
【问题情境】
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7300838ad476bc1c75c1cca1fc9880cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/93597410-233d-4a22-b5f3-45dcb35f3208.png?resizew=398)
【问题探究】
点P从点A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,点Q从点B出发,以每秒1个单位长度的速度向左匀速运动.设运动时间为t秒.
(1)t秒后,点P表示的数为______,点Q表示的数为______;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
【深入思考】
若M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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【推荐2】如图,已知数轴上有三点 A,B,C ,若用 AB 表示 A,B 两点的距离,AC 表示 A ,C 两点的 距离,且 BC 2 AB ,点 A 、点C 对应的数分别是a 、c ,且| a 20 | | c 10 | 0 .
![](https://img.xkw.com/dksih/QBM/2020/1/10/2374197783363584/2375340424077312/STEM/7dd4bf2cacf04d72af5c0cad77d19783.png?resizew=270)
(1)若点 P,Q 分别从 A,C 两点同时出发向右运动,速度分别为 2 个单位长度/秒、5个单位长度/ 秒,则运动了多少秒时,Q 到 B 的距离与 P 到 B 的距离相等?
(2)若点 P ,Q 仍然以(1)中的速度分别从 A ,C 两点同时出发向右运动,2 秒后,动点 R 从 A点出发向左运动,点 R 的速度为1个单位长度/秒,点 M 为线段 PR 的中点,点 N为线段 RQ的中点,点R运动了x 秒时恰好满足 MN AQ 25,请直接写出x的值.
![](https://img.xkw.com/dksih/QBM/2020/1/10/2374197783363584/2375340424077312/STEM/7dd4bf2cacf04d72af5c0cad77d19783.png?resizew=270)
(1)若点 P,Q 分别从 A,C 两点同时出发向右运动,速度分别为 2 个单位长度/秒、5个单位长度/ 秒,则运动了多少秒时,Q 到 B 的距离与 P 到 B 的距离相等?
(2)若点 P ,Q 仍然以(1)中的速度分别从 A ,C 两点同时出发向右运动,2 秒后,动点 R 从 A点出发向左运动,点 R 的速度为1个单位长度/秒,点 M 为线段 PR 的中点,点 N为线段 RQ的中点,点R运动了x 秒时恰好满足 MN AQ 25,请直接写出x的值.
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【推荐1】若等腰三角形两边长分别为 m,n,且 m,n 满足 2
+3
=n﹣6,求此等腰三角形的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf73ce501b7f1e21f17bc47fad3aec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f54e2a334c398dbd82fce879531c98.png)
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【推荐2】如图,已知
中,
,点D、E在直线
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/c70a07e4-d68d-4aa8-956c-96a27ecc27b6.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/6f19e95a-3e0f-47da-aedd-184d44ecae03.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/5197c144-92b6-47d3-bd20-e67bbccfffdf.png?resizew=249)
(1)如图1,求证:
;
(2)如图2,过点D向下作
,交
的延长线于点F,若
,
,求证:
;
(3)如图3,在(2)的条件下,延长
、
交于点G,若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/c70a07e4-d68d-4aa8-956c-96a27ecc27b6.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/6f19e95a-3e0f-47da-aedd-184d44ecae03.png?resizew=250)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/26/5197c144-92b6-47d3-bd20-e67bbccfffdf.png?resizew=249)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32ac820e9ab572690649f16b87aa273.png)
(2)如图2,过点D向下作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cebee623ba7d2033c94c503e4a4c699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e534e425e5939ae71dfdae6f2aea84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bae20ce509b25695607c660bf7023fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abdf59df37ca13e83b9b331ae571fd2.png)
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e3cb7df02cbcc132d5be0742b47714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20683a51b74c399f4980ae6889a369.png)
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【推荐1】如图,已知
,M是
上一点,N是
上一点,
,
.点P从M点出发,沿着M→O→B的方向运动,同时,点Q从N点出发,沿着N→O→A的方向运动.在射线
上运动时,点P和点Q每秒运动2个单位;当在射线
上运动时,点P和点Q每秒运动1个单位.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/ab5af889-1c6f-45ed-9729-e31991bfd6e9.png?resizew=160)
(1)点P从点M运动到点N共用多长时间?
(2)经过多少时间,有
?
(3)在点P和点Q运动的过程中,存在常数a恰好有三个不同的时间使得
成立,求a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64fc3916425edfc9b14598ef62c68d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/609e7cd4a32af9179673312c14cdf4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/ab5af889-1c6f-45ed-9729-e31991bfd6e9.png?resizew=160)
(1)点P从点M运动到点N共用多长时间?
(2)经过多少时间,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5f319082185eb0858f5be688af6ad5.png)
(3)在点P和点Q运动的过程中,存在常数a恰好有三个不同的时间使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b06dc274d0587ea837d76d031b39ec.png)
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名校
【推荐2】【课本探究】小明在学习《苏科版七上·数学》课本第31页“数学实验室”中碰到如下问题:
如图2-14,把笔尖放在数轴的原点,沿数轴先向左移动5个单位长度,再向右移动3个单位长度,这时笔尖停在“
”的位置上.用算式可以将结果表示为:
.
【深度思考】小明运用“由特殊到一般”的数学思想方法,得出结论:若表示数m的点向左平移
个单位长度,得到的点表示的数为
;向右平移
个单位长度,得到的点表示的数为
.
【实际应用】数轴上A、B、C、D 四点表示的数分别为a,b,c,d,且点A向右移动1个单位长度到点B位置,点B向右移动
个单位长度到点C位置,点C向右移动
个单位长度到点D位置,
(1)当
时,则
;
;
;
(2)在(1)的条件下,若A、B两点分别以2个单位长度每秒的速度向右运动,同时C、D两点分别以1个单位长度每秒的速度向左运动,设运动时间为t秒,当A、B两点中至少有一个点落在C、D之间时(不包含C、D两点),求运动时间t的取值范围是多少?
(3)若a,b,c,d这四个数的和与其中的三个数的和相等,
,求出a可能的值.
(4)若a,b,c,d这四个数的积为正数,且这四个数的和与其中的两个数的和相等.当n为任意正整数时,a始终为整数.求此时a与n之间的数量关系式 .
如图2-14,把笔尖放在数轴的原点,沿数轴先向左移动5个单位长度,再向右移动3个单位长度,这时笔尖停在“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4df85ec4b9e08a03c946767549402d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/2dbf6c12-da0f-49a0-9e1a-0a348b9bc1b4.png?resizew=313)
【深度思考】小明运用“由特殊到一般”的数学思想方法,得出结论:若表示数m的点向左平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81300110b3e11cece7f1162fe3fb3291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb5aca8a52f2f9b36fcc7d6f69232c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81300110b3e11cece7f1162fe3fb3291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd1f0ace9ca0b79929e73af6c201c2e.png)
【实际应用】数轴上A、B、C、D 四点表示的数分别为a,b,c,d,且点A向右移动1个单位长度到点B位置,点B向右移动
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81300110b3e11cece7f1162fe3fb3291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0876215b2fd463d151523cd3c6b447.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269772bfb53fbe5e7565252d0f55613f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
(2)在(1)的条件下,若A、B两点分别以2个单位长度每秒的速度向右运动,同时C、D两点分别以1个单位长度每秒的速度向左运动,设运动时间为t秒,当A、B两点中至少有一个点落在C、D之间时(不包含C、D两点),求运动时间t的取值范围是多少?
(3)若a,b,c,d这四个数的和与其中的三个数的和相等,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398b50881e7e8fa02c3e6835f26029f7.png)
(4)若a,b,c,d这四个数的积为正数,且这四个数的和与其中的两个数的和相等.当n为任意正整数时,a始终为整数.求此时a与n之间的数量关系式 .
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