如图,已知线段DA与B、C两点,用圆规和无刻度的直尺按下列要求画图并计算:
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897224633458688/2919231784992768/STEM/ccf66cbf-2d4d-4a0e-9f19-e981a53a5d18.png?resizew=166)
(1)画直线AB、射线DC;
(2)延长线段DA至点E,使
(保留作图痕迹);
(3)若AB=2cm,AD=4cm,求线段DE的长,
![](https://img.xkw.com/dksih/QBM/2022/1/8/2897224633458688/2919231784992768/STEM/ccf66cbf-2d4d-4a0e-9f19-e981a53a5d18.png?resizew=166)
(1)画直线AB、射线DC;
(2)延长线段DA至点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
(3)若AB=2cm,AD=4cm,求线段DE的长,
20-21七年级上·浙江绍兴·期末 查看更多[4]
浙江省绍兴市柯桥区2020-2021学年七年级上学期期末数学试题广东省河源市和平县2021-2022学年七年级上学期期末数学试题浙江省舟山市普陀区2021-2022学年七年级上学期期末数学试题(已下线)第11讲 图形的初步认识(一)(7大考点)-2022-2023学年七年级数学上学期考试满分全攻略(浙教版)
更新时间:2022-02-18 20:15:10
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解答题-作图题
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【推荐1】尺规作图:如图,已知线段a,b(不写作法,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/ce241d4a-3068-425e-85a4-da47c8838b07.png?resizew=79)
(1)作线段AB,使AB=a;
(2)作线段CD,使CD=2a+b.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/ce241d4a-3068-425e-85a4-da47c8838b07.png?resizew=79)
(1)作线段AB,使AB=a;
(2)作线段CD,使CD=2a+b.
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【推荐1】如图所示,点
在线段
的延长线上,且
,
是
的中点.看图说话:![](https://img.xkw.com/dksih/QBM/2017/3/7/1638721205673984/1645233129054208/STEM/8e45d11097634c6f9c058ff70b03eff1.png?resizew=145)
(1)图形中共有 条线段.
(2)若
,求
的长.
解:
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea77d2e0ae6eb2f160df97acb48d6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dc6128f3c3a7737d9d2520b37bd5f3.png)
是
的中点,
(中点定义)
.
![](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/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638721205673984/1645233129054208/STEM/8e45d11097634c6f9c058ff70b03eff1.png?resizew=145)
(1)图形中共有 条线段.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405e1f38f1db7ec3d99e435df2158d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3cccb244b1c5c3804d1175abc8e8a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea77d2e0ae6eb2f160df97acb48d6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dc6128f3c3a7737d9d2520b37bd5f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c56afd59592dbb194c87cdd725b7dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e7a9a73231b3dd42349fdc1b8b6c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebef43d0c85050bea325133f2e023dff.png)
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【推荐2】如图,已知线段
上有一点
,点
、点
分别为
、
的中点,如果
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/e0369ada-9ef0-4594-88c0-c62b847c5ab3.png?resizew=154)
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【推荐3】【定义】:
若点P在线段
上,当
时,我们称m为点P在线段
上的“分值”,记作
.
【理解】:
如点P是
的中点时,即当
,则
;反过来,当
时,则
.因此,我们可以这样理解:“
”与“
”具有相同的含义.
【应用】:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/2b02f601-a5f2-4bb1-bea0-af3ff5aa2044.png?resizew=406)
(1)如图1,点P在线段
上.若
,则
= ;若
,则
.
(2)如图2,已知线段
,点P,Q分别从点A、B同时出发,相向运动,点P到达点B时,P,Q都停止运动,设运动时间为
.
① 若点P,Q的运动速度均为
,试用含t的代数式表示
和
,并说明:
;
② 若点P和点Q的运动速度分别为
和
,点Q到达点A后立即以原速返回B,当t为何值时,
.
若点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/569a9fffe6613ecca07fb4d3f19d5723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5cd5c9eff3698970d71427ca10aa1.png)
【理解】:
如点P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75558fc06a89e0a46bacdb61646580dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c903a94b2957ccdd60f99b44dc6040c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c903a94b2957ccdd60f99b44dc6040c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75558fc06a89e0a46bacdb61646580dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c67e39bc77a7bdd364f2694fe6f2b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5cd5c9eff3698970d71427ca10aa1.png)
【应用】:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/2b02f601-a5f2-4bb1-bea0-af3ff5aa2044.png?resizew=406)
(1)如图1,点P在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a05614f461ec053fabcf25b064aaa2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ab40260ac9056153d14d70d2519371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e769f46ae76f54376e66d58d7324f715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914543d476200ae6a87e857e93781168.png)
(2)如图2,已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9040c9795e7132ebf65ede1f98c4d72b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
① 若点P,Q的运动速度均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654bdcd4d474a9899693db1eec0d71e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f2cebd4e555a3d6938ff5192bf36a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7533d44d7dd902e8524ecddb6f374a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee472c08e290fd56ced9a1e9e9959a9.png)
② 若点P和点Q的运动速度分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d1c5957476505eb416f33e2940c49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73f3d840fcda9bf55aef0aa147e21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d122e4c3afc2755ae49474ecb43655.png)
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解答题-作图题
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【推荐1】解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/4327122d-7003-40b3-bc12-125994f154e3.png?resizew=108)
(1)画线段
、
,并延长
、
相交于点E;
(2)画直线
,射线
;
(3)过D点作
;
(4)过D点作
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/4327122d-7003-40b3-bc12-125994f154e3.png?resizew=108)
(1)画线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(2)画直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(3)过D点作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
(4)过D点作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b26bda957f096d242dd771d4edf96b99.png)
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【推荐2】(1)根据下列语句,画出图形.如图,已知四点
.
①画出直线
;
②连接
,相交于点
;
③画射线
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/85c98909-bb5a-4b8c-bcd5-737492b9ffb0.png?resizew=130)
(2)请按要求在方格内分别画出从这个几何体的三个不同方向看到的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
①画出直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
③画射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/85c98909-bb5a-4b8c-bcd5-737492b9ffb0.png?resizew=130)
(2)请按要求在方格内分别画出从这个几何体的三个不同方向看到的形状.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/b5f29317-cedc-4eaa-a518-b5ddf58e703b.png?resizew=490)
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