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)
更新时间:2022-05-15 09:49:12
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相似题推荐
解答题-作图题
|
适中
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名校
【推荐1】如图,平面内有线段
和点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/187c6ac0-c4bb-45f6-80c9-941b535f44c0.png?resizew=124)
(1)按下面的要求作图:(要求:利用尺规,不写画法,保留作图痕迹)
①连接
;
②作射线
;
③延长线段
到点C使得
.
(2)若
,点M是线段
的中点,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/187c6ac0-c4bb-45f6-80c9-941b535f44c0.png?resizew=124)
(1)按下面的要求作图:(要求:利用尺规,不写画法,保留作图痕迹)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
②作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
③延长线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41411e7e692266e5e358e3796f2b403d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b8a1e64c7beb194fe347ceac490f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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解答题-问答题
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【推荐2】直线l上的三个点A,B,C,若满足
,则称点C是点A关于点B的“半距点”.如图1,
,此时点C就是点A关于点B的一个“半距点”.如图2,若M,N,P三个点在同一条直线m上,且点P是点M关于点N的“半距点”,
.
(1)①当点P在点N的左侧时,求
的长度;
②当点P在点N的右侧时,求
的长度;
(2)若点G也是直线m上一点,且点G是线段
的中点,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02f2cce7361a3ea77a4d4d9147faca5.png)
(1)①当点P在点N的左侧时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
②当点P在点N的右侧时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
(2)若点G也是直线m上一点,且点G是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/bd61b75f-a57d-47e3-ad4c-8077ae39df09.png?resizew=257)
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解答题-问答题
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【推荐1】阅读下面的解题过程,解答后面的问题:
如图
,在平面直角坐标系
中,
,
,
为线段
的中点,求
点的坐标;
解:分别过
,
作
轴的平行线,过
,
作
轴的平行线,两组平行线的交点如图
所示,设
,则
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2520fea076bec214dfdecbb56ac185be.png)
由图
可知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a8496b6448a1b40f79ba1afb2abb29.png)
线段
的中点
的坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d65ef5a2408da96243544a798dc17d4.png)
![](https://img.xkw.com/dksih/QBM/2019/9/6/2284928358449152/2285059033128960/STEM/6fe5a19ac2054cedb74e93a3a1b08930.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/2019/9/6/2284928358449152/2285059033128960/STEM/468ffc27e15f48d6b8c755be521859b1.png?resizew=273)
【应用新知】
利用你阅读获得的新知解答下面的问题:
(1)已知
,
,则线段
的中点坐标为
(2)平行四边形
中,点
,
,
的坐标分别为
,
,
,利用中点坐标公式求点
的坐标.
(3)如图
,点
在函数
的图象上,
,
在
轴上,
在函数
的图象上 ,以
,
,
,
四个点为顶点,且以
为一边构成平行四边形,直接写出所有满足条件的
点坐标.
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
解:分别过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132668fc41c8266ba917dc5b4995c6b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09aa019443dc4ec8fbfa824b60c10c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66c36e627a19f42254111aff975a992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2520fea076bec214dfdecbb56ac185be.png)
由图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274dd49cf294d6435dd757334a748d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35a8496b6448a1b40f79ba1afb2abb29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](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/7d65ef5a2408da96243544a798dc17d4.png)
![](https://img.xkw.com/dksih/QBM/2019/9/6/2284928358449152/2285059033128960/STEM/6fe5a19ac2054cedb74e93a3a1b08930.png?resizew=169)
![](https://img.xkw.com/dksih/QBM/2019/9/6/2284928358449152/2285059033128960/STEM/468ffc27e15f48d6b8c755be521859b1.png?resizew=273)
【应用新知】
利用你阅读获得的新知解答下面的问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa3305ac6ef7117a61b3ed9fffb03030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22340d6f2582502d69a5cb85f446ff43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf03e87dd5d82d30fd01be26cee1f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ebed6dde43b2739701f1c7195627b7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9205b92dbbac16ae84fc8810e80613f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215cf9cfac95af95708707f14438675f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-作图题
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名校
【推荐2】如图,点A,B,C是不在一条直线上的三个点,过B,C两点作直线,并连接
,
.
(1)尺规作图:延长
至D,使得点A为
的中点,作射线
,在射线
上截取
.(作图工具只限直尺和圆规,保留作图痕迹)
(2)若
,求
的长.
![](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/2024/2/16/ff8389c2-6a3f-4f63-9137-1c56e7b9ef1f.png?resizew=158)
(1)尺规作图:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/6daf0518f735d80abefa2a7b37f9187f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ae3a066ad365deef67fe335f60f031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-作图题
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名校
【推荐1】如图,已知线段
,延长线段
至点
,使
,
是
中点.
![](https://img.xkw.com/dksih/QBM/2023/2/23/3180924398108672/3183044242309120/STEM/abb7751ce98a46beab8207f8559fb52a.png?resizew=93)
(1)根据题意,把图形画出来.
(2)若
,求
的长.
![](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/c5db41a1f31d6baee7c69990811edb9f.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/2023/2/23/3180924398108672/3183044242309120/STEM/abb7751ce98a46beab8207f8559fb52a.png?resizew=93)
(1)根据题意,把图形画出来.
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图,
是线段
上的一点,线段
,
,
是
的中点,
是
的中点,求线段
、
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101f78049c744e6b30df21a521ddb73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e5949591e3ba5cc83db447ea061ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/e8d15385-4da0-492f-aa7d-3406e1d7cb06.png?resizew=237)
您最近一年使用:0次