如图1将线段AB,CD放置在直线l上,点B与点C重合,AB=10cm,CD=15cm,点M是线段AC的中点,点N是线段BD的中点.解答下列问题:
![](https://img.xkw.com/dksih/QBM/2022/2/8/2912043407204352/2913940391002112/STEM/3ba030a8e0e54e1f99f065969c0cf956.png?resizew=550)
(1)MN=
(2)将图1中的线段AB沿DC延长线方向移动xcm至图2的位置.
①当x=7cm时,求MN的长.
②在移动的过程中,请直接写出MN,AB,CD之间的数量关系式.
![](https://img.xkw.com/dksih/QBM/2022/2/8/2912043407204352/2913940391002112/STEM/3ba030a8e0e54e1f99f065969c0cf956.png?resizew=550)
(1)MN=
(2)将图1中的线段AB沿DC延长线方向移动xcm至图2的位置.
①当x=7cm时,求MN的长.
②在移动的过程中,请直接写出MN,AB,CD之间的数量关系式.
21-22七年级上·浙江绍兴·期末 查看更多[2]
更新时间:2022-02-11 08:49:48
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【推荐1】如图,已知线段
,点
为
上的一个动点,点
、
分别是
和
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/60573bd6-fc16-4b6a-bb43-13cd9e2e00f1.png?resizew=262)
(1)若点
恰好是
的中点,则
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1084d40c152c3c7674f377c2725cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/60573bd6-fc16-4b6a-bb43-13cd9e2e00f1.png?resizew=262)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b404afece8085fb1cef15c08ca78ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐2】已知:如图,点
为线段
的中点,点
为线段
上的点,点
为线段
的中点.
(1)若线段
,
,求
的值
(2)如图
,在(1)的条件下,求线段
的长.
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643675804893184/2647331347546112/STEM/f7f051e0-ba26-4c09-8eae-6825361cddc9.png)
(3)如图
,若
,求线段
的长
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(1)若线段
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(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2643675804893184/2647331347546112/STEM/f7f051e0-ba26-4c09-8eae-6825361cddc9.png)
(3)如图
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【推荐3】已知在数轴上有A,B两点,点A表示的数为8,点B在A点的左边,且
.若有一动点P从数轴上点A出发,以每秒3个单位长度的速度沿数轴向左匀速运动,动点Q从点B出发,以每秒2个单位长度的速度沿着数轴向右匀速运动,设运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/95a00cea-fc8c-4e7d-821d-b2bf7d5ab0ba.png?resizew=227)
(1)当
秒时,写出数轴上点B,P、Q所表示的数分别为_______________、_______________、_______________;
(2)若点P,Q分别从A,B两点同时出发,当点P与点Q重合时,求t的值;
(3)若M为线段
的中点,点N为线段
的中点.当点M到原点的距离和点N到原点的距离相等时,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/95a00cea-fc8c-4e7d-821d-b2bf7d5ab0ba.png?resizew=227)
(1)当
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(3)若M为线段
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【推荐1】已知点C,点D,点E都在线段AB上,
,点D是线段AC的中点.
(1)如图①,若点E是线段BD的中点,当
时,求CE的长;
(2)如图②,若点E是线段BC的中点,当
时,求DE的长(用含a的代数式表示).
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/a71f3458-7850-4cd7-bd13-86dbac74aaa8.png?resizew=393)
(1)如图①,若点E是线段BD的中点,当
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(2)如图②,若点E是线段BC的中点,当
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【推荐2】如图,点B在线段AD上,且BD=3AB,点C是线段BD的中点,若CD=6cm,求线段AC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/7/14fdb173-f190-4cfb-a702-cc228b0361a3.png?resizew=242)
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