尺规作图:(要求:不写作法,保留痕迹,指出所求)已知:如图,已知线段a、b,请你作一条线段AD,使它等于2a﹣b.
![](https://img.xkw.com/dksih/QBM/2020/1/9/2373224689598464/2374217571057664/STEM/f970fb0d9ea7401482d68fae7e839b75.png?resizew=82)
更新时间:2020-01-10 19:40:55
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相似题推荐
解答题-作图题
|
较易
(0.85)
【推荐1】如图,已知线段
,射线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/80139847-7e9d-4cdb-a44d-5a6a340f0082.png?resizew=366)
(1)尺规作图:在射线
上截取
,
,且
(保留作图痕迹,不写作法);
(2)在(1)的图中,标出
的中点
,
的三等分点
(
左
右),并用含
的式子表示线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/80139847-7e9d-4cdb-a44d-5a6a340f0082.png?resizew=366)
(1)尺规作图:在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86916b52fa005d7702794c229b6bae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb245009e20bdaf0a6c040b1074e66d.png)
(2)在(1)的图中,标出
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.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/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-作图题
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名校
【推荐2】如图所示,已知线段
,点
为
中点,点
是线段
外一点.
①作射线
,作直线
;
②延长线段
至点
,使得
.
(2)在(1)的条件下,若线段
,则线段
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②延长线段
![](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/ebe44ff9f829f6c034682572ad00e366.png)
(2)在(1)的条件下,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df3b2901ad26337818f75e81448ebb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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