如图,已知直线l和直线外三点A、B、C,按下列要求画图(不写作法和结论).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/c74f2ac8-cecd-4b22-bda2-fbf4a5ae3e2d.png?resizew=217)
(1)画射线
;
(2)连接
并延长
至D,使得
;
(3)在直线l上确定点E,使得
最小,且写出这样做的理由是___________________________.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/c74f2ac8-cecd-4b22-bda2-fbf4a5ae3e2d.png?resizew=217)
(1)画射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
(3)在直线l上确定点E,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769688bfdcb3a9e1f17548033aadc6fe.png)
更新时间:2023-03-09 10:52:36
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,已知三点A,B,C,按下列要求画图.
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083421159424/2950440676179968/STEM/6a829b2d-1ceb-4387-b571-22e0f9489bae.png?resizew=172)
(1)画直线AB,射线BC;
(2)连接AC并延长至点D,使DC=AC;
(3)取线段AB的中点E,找出一点P,使它到点E,B,D,C的距离之和PE+PB+PD+PC最小,这样作图的依据是 .
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894083421159424/2950440676179968/STEM/6a829b2d-1ceb-4387-b571-22e0f9489bae.png?resizew=172)
(1)画直线AB,射线BC;
(2)连接AC并延长至点D,使DC=AC;
(3)取线段AB的中点E,找出一点P,使它到点E,B,D,C的距离之和PE+PB+PD+PC最小,这样作图的依据是 .
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解答题-问答题
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适中
(0.65)
【推荐2】如图,已知二次函数
过点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/7ddfb8b2-c291-4051-b7bc-f43424663c60.png?resizew=226)
(1)求此二次函数的解析式;
(2)在抛物线上存在一点P使
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(3)在抛物线对称轴上是否存在一点M,使得
最小,若存在,求出点M的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/7ddfb8b2-c291-4051-b7bc-f43424663c60.png?resizew=226)
(1)求此二次函数的解析式;
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(3)在抛物线对称轴上是否存在一点M,使得
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解答题-作图题
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适中
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【推荐1】如图,平面内有线段
和点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(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
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;③延长线段
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(2)若
,
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是线段
的中点,将点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/4b6db19e-433f-4e8d-b556-0ed27417b309.png?resizew=110)
(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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.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/41411e7e692266e5e358e3796f2b403d.png)
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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解答题-作图题
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适中
(0.65)
【推荐2】作图题:如图,在平面内有不共线的3个点,
.
![](https://img.xkw.com/dksih/QBM/2020/12/28/2630151690706944/2636139562311680/STEM/29946aac-7da7-49bd-a868-30eaac4a5714.png?resizew=185)
(1)作射线
,在线段
的延长线上取一点
,使
;
(2)作线段
并延长
到点
,使
;
(3)连接
,
;
(4)度量线段
和
的长度,直接写出二者之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://img.xkw.com/dksih/QBM/2020/12/28/2630151690706944/2636139562311680/STEM/29946aac-7da7-49bd-a868-30eaac4a5714.png?resizew=185)
(1)作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
(2)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d197ea8c1c8bbdf5edade431388eb713.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(4)度量线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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