如图,某小区的两个喷泉A,B位于小路
的同侧,两个喷泉的距离
的长为
.现要为喷泉铺设供水管道
,
,供水点M在小路
上,供水点M到
的距离
的长为
,
的长为
.
(2)求喷泉B到小路
的最短距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b24b3739edc7d1c0092502a649c8e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26200dc5e0e1b1f84d1623cb36e828f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d76372b03ef26cb292810f5e89726e17.png)
(2)求喷泉B到小路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
2024七年级下·全国·专题练习 查看更多[2]
(已下线)第02讲 轴对称-最短路径问题(知识解读+达标检测)-2023-2024学年七年级数学下册《知识解读·题型专练》(北师大版)河南省信阳市罗山县2023-2024学年八年级下学期期中数学试题
更新时间:2024-05-22 22:56:53
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解答题-问答题
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适中
(0.65)
【推荐1】定义:在平面直角坐标系
中,已知点
,
,
,这三个点中任意两点间的距离的最小值称为点
,
,
的“最佳间距”.例如:如图,点
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的“最佳间距”是1.
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(1)理解:点
,
,
的“最佳间距”是______;
(2)探究:已知点
,
,
.
①若点O,A,B的“最佳间距”是2,则y的值为______;
②点O,A,B的“最佳间距”最大是多少?请说明理由;
(3)迁移:当点
,
,
的“最佳间距”取到最大值时,点P的坐标是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff7768c2b3c99e26a9651d38755c99d.png)
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(1)理解:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f4d959c570141afd7d0d6abc3969012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919025c2d8eaf2705b44a7974d61eac2.png)
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(2)探究:已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce430cb41bd9b56df6eecac6f17146c.png)
①若点O,A,B的“最佳间距”是2,则y的值为______;
②点O,A,B的“最佳间距”最大是多少?请说明理由;
(3)迁移:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
平分
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,垂足为
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在平行四边形ABCD中,AC⊥CD,E为BC中点,点M在线段BE上,连接AM,AE,在BC下方有一点N,满足∠CAD=∠BCN,连接MN.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/1855fad4-b360-4347-942a-b8ced7b7ad00.png?resizew=406)
(1)若∠BCN=60°,求证:∠BAE=30°;
(2)若MA=MN,求证:∠NMC=∠MAE;
(3)在(2)的条件下,若MC=EA+CN,求证:AB=
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/1855fad4-b360-4347-942a-b8ced7b7ad00.png?resizew=406)
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【推荐2】如图:AB是⊙O的直径,CD⊥AB于E点,连接BC,过点O作OF⊥BC于点F,若CD=12cm,AE=4cm,求OF的长度.
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解答题-作图题
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适中
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名校
【推荐1】如图,将
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(0.65)
名校
【推荐2】如图,在
中,D是
的中点,
交
于点E,且
.
;
(2)若
,
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的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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