如图,点C、D在线段AB上,且点C是线段AB的中点,如果AC=5cm,BD=2cm,求线段CD的长度.
![](https://img.xkw.com/dksih/QBM/2019/4/15/2183052219129856/2184224522485760/STEM/d8e45ba1e6ad44548c9c01baf334c987.png?resizew=165)
17-18七年级上·内蒙古赤峰·期末 查看更多[4]
2017-2018学年内蒙古翁牛特旗乌丹第六中学七年级上学期期末考试数学试题甘肃省民勤县第六中学2018-2019学年七年级上学期期末考试数学试题(已下线)【新东方】【2019】【初一上】【NY】【月考】【数学】【冯婧收集】【XXX录入】(已下线)练习14 线段中点的有关计算-2020-2021学年【补习教材·寒假作业】七年级数学(湘教版)
更新时间:2018-01-16 12:50:23
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适中
(0.65)
【推荐1】已知
分别是两个不同的点
所表示的有理数,且
,
,它们在数轴上的位置如图所示:
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148474431143936/3149839354945536/STEM/2791c54d4f8242df89609437b7cd7f46.png?resizew=361)
(1)试确定数
.
(2)表示
两数的点相距几个单位?
(3)若
点在数轴上,
点到
点的距离是
点到
点距离的
,求
点表示的数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d38f3bef2d10ee488fb3423bbec4ac7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78866ea635f38545bca721b65af19884.png)
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148474431143936/3149839354945536/STEM/2791c54d4f8242df89609437b7cd7f46.png?resizew=361)
(1)试确定数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
(2)表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
(3)若
![](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/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/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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【推荐2】【问题情境】已知A,
,
,
四点在同一直线上,线段
,点
在线段
上.
【初步应用】(1)如图1,点
是线段
的中点,
,求线段
的长度;
【迁移应用】(2)若点
是直线
上的一点,且满足
,
,求线段
的长度.
![](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/01b1927db96d84f27197b5a654b622f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
【初步应用】(1)如图1,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/b4a669e5034243c0dce40b2d7fc57d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【迁移应用】(2)若点
![](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/f1e6e22f86843f2c0a6026760b690f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/8732f358-61b0-4b02-9fbd-2530f5881270.png?resizew=422)
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【推荐1】如图1,点
为线段
延长线上的一点,点
是
的中点,且点
不与点
重合,
,设
.
①若
,如图2,则
;
②用含
的代数式表示
的长,直接写出答案;
,
;
若点
为线段
上一点,且
,你能说明点
是线段
的中点吗?
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/8f0d4013-6f11-40db-a85c-0f3bf32de013.png?resizew=220)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/c032d974-8be4-4f4e-951a-a947d89303db.png?resizew=250)
②用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3919bf9dce67c9522d2f3878b69cac40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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【推荐2】(1)如图,已知点C在线段AB上,AC=6 cm,且BC=4 cm,M,N分别是AC,BC的中点,求线段MN的长度;
![](https://img.xkw.com/dksih/QBM/2018/8/4/2003124599267328/2005456892559361/STEM/bca52e42e0b344ab8d466ac36e6c7ad2.png?resizew=150)
(2)在(1)题中,如果AC=a cm,BC=b cm,其他条件不变,你能猜出MN的长度吗?请你用一句简洁的话表述你发现的规律;
(3)对于(1)题,如果我们这样叙述它:“已知线段AC=6 cm,BC=4 cm,点C在直线AB上,M,N分别是AC,BC的中点,求MN的长度.”结果会有变化吗?如果有,求出结果.
![](https://img.xkw.com/dksih/QBM/2018/8/4/2003124599267328/2005456892559361/STEM/bca52e42e0b344ab8d466ac36e6c7ad2.png?resizew=150)
(2)在(1)题中,如果AC=a cm,BC=b cm,其他条件不变,你能猜出MN的长度吗?请你用一句简洁的话表述你发现的规律;
(3)对于(1)题,如果我们这样叙述它:“已知线段AC=6 cm,BC=4 cm,点C在直线AB上,M,N分别是AC,BC的中点,求MN的长度.”结果会有变化吗?如果有,求出结果.
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