已知线段
a(a是常数),点C和点F为直线
上两点,点E在线段
上,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/01eb926b-1401-4b8d-9f8d-3b93a9ef57a3.png?resizew=225)
(1)若点C恰好是线段
的中点,点F在线段
上,则
_____(用含a的代数式表示);
(2)若点C在点B的右侧,
的长是否是定长,若是定长,请求出这个定长;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ada78ba2340436d059a5e1365e771b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc68246c6e5502b67fbcf3583dafe019.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/01eb926b-1401-4b8d-9f8d-3b93a9ef57a3.png?resizew=225)
(1)若点C恰好是线段
![](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/1a71a9d21f77e9535de152bb33f802bb.png)
(2)若点C在点B的右侧,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
21-22七年级上·江苏无锡·期末 查看更多[3]
江苏省无锡市滨湖区2021-2022学年七年级上学期期末数学试题(已下线)期末卷A卷-【帮课堂】2022-2023学年七年级数学上册同步精品讲义(苏科版) (已下线)专题11解答压轴题(精选60道)-【好题汇编】备战2023-2024学年七年级数学上学期期末真题分类汇编(苏科版)
更新时间:2022-04-03 15:09:06
|
【知识点】 线段的和与差
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知线段AB=20cm,CD=4cm,点E是AC的中点,点F是BD的中点.
(1)若AC=6cm,求线段EF的长度;
(2)当线段CD在线段AB上从左向右或从右向左运动时,试判断线段EF的长度是否发生变化,如果不变,请求出线段EF的长度;如果变化,请说明理由.
(1)若AC=6cm,求线段EF的长度;
(2)当线段CD在线段AB上从左向右或从右向左运动时,试判断线段EF的长度是否发生变化,如果不变,请求出线段EF的长度;如果变化,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/9e6a4b48-faac-499e-a75b-4f35e700c5f9.png?resizew=216)
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解答题-问答题
|
适中
(0.65)
名校
【推荐2】已知如图,
三点在同一直线上,
.
(1)已知点
在直线
上,根据条件,请补充完整图形,并求
的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/67ac42ff-00af-42f7-b557-fb5404ab6c36.png?resizew=285)
(2)已知点
在直线
上,
分别是
,
的中点,根据条件,请补充完整图形,并求
的长,直接写出
与
的长存在的数量关系;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/248f8124-abfd-4bd0-aab0-bbb428447832.png?resizew=287)
(3)已知点
在直线
上,
分别是
,
的中点,根据条件,请补充完整图形,并求
的长,直接写出
与
的长存在的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4bb0d42ff54b413789618d7ffa2cce.png)
(1)已知点
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/67ac42ff-00af-42f7-b557-fb5404ab6c36.png?resizew=285)
(2)已知点
![](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/7789a500686c7a73770404ead6af0590.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/248f8124-abfd-4bd0-aab0-bbb428447832.png?resizew=287)
(3)已知点
![](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/7789a500686c7a73770404ead6af0590.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/3277e1c5-0509-4885-b9fc-830b657dc51b.png?resizew=285)
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