点C在线段
上满足
,点D和点E是线段
上的两动点(点D在点E的左侧)满足
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/5f7a0914-6c89-464e-a34a-a9a898db19fd.png?resizew=419)
(1)当点E是
的中点时,求
的长度;
(2)当
时,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d3976d08e5f9e24e76ce9579c06a8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729e354eda68ba522035aa96344f216c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e28c0a00115e4c92f392c6a22dc41abc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/5f7a0914-6c89-464e-a34a-a9a898db19fd.png?resizew=419)
(1)当点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edca1f81c9d722666eb7dea9c509d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2024-03-05 13:45:05
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】[背景知识]:
数轴是初中数学的一个重要工具,利用数轴可以将数与形完美地结合.研究数轴我们发现了许多重要的规律:若数轴上点
、点
表示的数分别为
、
,则
,
两点之间的距离
,线段
的中点表示的数为
.
[问题情境]:
如图,数轴上点
表示的数为
,点
表示的数为6,点
从点
出发,以每秒4个单位长度的速度沿数轴向右匀速运动,同时点
从点
出发,以每秒2个单位长度的速度向左匀速运动,设运动时间为
秒
.
[综合运用]:
(1)线段
的中点表示的数为________.
(2)求:当
为何值时,
;
(3)若点
为
的中点,点
为
的中点,点
在运动过程中,线段
的长度是否发生变化?若变化,请说明理由;若不变,请求出线段
的长.
数轴是初中数学的一个重要工具,利用数轴可以将数与形完美地结合.研究数轴我们发现了许多重要的规律:若数轴上点
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.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/f26c45b1c50349cb0e320dd627e2094d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
[问题情境]:
如图,数轴上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07eabb3ff92cc5e071c48df759e64ab8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/85119fb6-d3ca-4230-8618-f5af3748b4dc.png?resizew=475)
[综合运用]:
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c656767a0d81446466f97b88eaee401.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,数轴上有A、
两点,点A对应的数是
,点
在点A的右侧,和点A相距6个单位长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/1dc59e2c-b33c-433f-bc69-08f7eea0f372.png?resizew=184)
(1)求出点
所对应的有理数;
(2)若点
到点A、
的距离之和是10个单位长度,求出点
所对应的有理数;
(3)在(2)的条件下,如果点
从点
出发,沿数轴正方向以每秒1个单位长度的速度运动,同时点
以每秒4个单位长度的速度沿数轴正方向运动,求经过几秒后
、
两点相距6个单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edbd40e04e2a943051fa83d6e511add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/1dc59e2c-b33c-433f-bc69-08f7eea0f372.png?resizew=184)
(1)求出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
(3)在(2)的条件下,如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/acc290b44635265137fdf13146b6a6d9.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,
为线段
上一点,
为
的中点,
为
的中点,其中
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/a3979d13-86a7-4bd6-88dd-51b1f363b385.png?resizew=180)
(1)若
.求
;
(2)若
为
上一点,满足
,请说明:点
是线段
的中点.
![](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/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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9880d79a0561de9e0cc7e430a115aa09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/a3979d13-86a7-4bd6-88dd-51b1f363b385.png?resizew=180)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d7e34fdb63c677535258f83a04b253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】如图,已知AC=3AB,BC=12,点D 是线段AC的中点,求BD的长度.
![](https://img.xkw.com/dksih/QBM/2018/12/20/2100947801620480/2102555312775169/STEM/d8772d52f8ff4739b93616de97fa905a.png?resizew=209)
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