先作图,再解答:在直线l上顺次取A,B,C三点,使线段AB=2cm,线段BC=3cm.点O是线段AC的中点.求出线段OB的长度是多少cm?
更新时间:2022-05-02 15:23:03
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解答题-作图题
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【推荐1】如图,已知线段
,
,
,射线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/d6a2ae97-c5b7-43b4-ba4f-fd26b050ab08.png?resizew=388)
实践与操作:
在射线
上作线段
,
.(要求:尺规作图,保留作图痕迹,不写作法).
推理与探究:
若点
是线段
的中点,点
是线段
的中点.请在上图中标出点
,
;
猜想:线段
与
有怎样的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/d6a2ae97-c5b7-43b4-ba4f-fd26b050ab08.png?resizew=388)
实践与操作:
在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a120e7d05950c06e9e6737c36b4b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0db684c31f14df025e297701ce90c2.png)
推理与探究:
若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
猜想:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-问答题
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(0.85)
【推荐2】如图,已知线段
长
,点
、
、
、
顺次在
上,且
,
是
的中点,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa8b61c9c4fe3d2f8d81d75f283ac69.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce072bcd423b56c827e40f0b731de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946f92594af50f67f1a92c040b4c54cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2022/1/2/2893007194816512/2894876394283008/STEM/e31d1505-af15-4c1a-a91e-384e813550fd.png?resizew=244)
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解答题-问答题
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【推荐1】如图,点E是线段AB的中点,点C在线段AB 上,且
,点F是线段AC的中点,
,求线段AB和CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da054f3adc86a67719a5dc7e3b2c9198.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899318920601600/3025777899823104/STEM/5898532b6f6d4cd787182b2fe31c017f.png?resizew=452)
您最近一年使用:0次
解答题-问答题
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(0.85)
【推荐2】如图,线段
,点
,
分别是线段
,
的中点,且线段
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cc6ebe3a443327530a2538e4013fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d64136e8df70e49cb4ec14ae5a0cdf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/12/9/3127073596776448/3171005836926976/STEM/40199e89bc57491985bafc96fdc84f4e.png?resizew=272)
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解答题-问答题
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【推荐1】如图,点C,B为线段
上两点,
,M,N分别为
的中点,若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a1d4d18c77021c769a5b6e0b738d35f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31987185092e96fd0c5cb245bd78199e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/16/2895779590823936/2936103773200384/STEM/eebda2bf-0b99-41f7-a4b1-3edf42316dd9.png?resizew=256)
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名校
【推荐2】如图,
,D是
的中点,
cm,求
的长.
解:
cm且
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8d4ba86966baab5a804414573ca070.png)
cm,
cm,
是
的中点,
cm,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56577eaa2f4ed14e6e4330a801a59293.png)
cm.(以上均直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/29/8711ffc8-2264-4da0-a154-8fd311d49d13.png?resizew=226)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c7af82dc804c0270f4dbcd6f4168f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8d4ba86966baab5a804414573ca070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7bb418ec3d8af7fd1a157935169ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c56afd59592dbb194c87cdd725b7dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8616e668322ae408d878e8a541a295c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56577eaa2f4ed14e6e4330a801a59293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
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