![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
A.4 | B.![]() | C.4![]() | D.2![]() |
更新时间:2019-07-10 10:35:51
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【知识点】 最短路径问题
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【推荐1】如图,在长方形
中,
,
,点E是
边上一点,且
,连接
;①
;②当
时,
平分
;③
周长的最小值为15;④当
时,
平分
.其中正确的个数有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/28/abf84dce-97fe-4409-ad1d-b773182adc85.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.4个 | B.3个 | C.2个 | D.1个 |
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【推荐2】如图,在公路 MN 两侧分别有 A
, A
......A
,七个工厂,各工厂与公路 MN(图中粗线)之间有小公路连接.现在需要在公路 MN 上设置一个车站,选择站址的标准是“使各工厂到车站的距离之和越小越好”.则下面结论中正确的是( ).
①车站的位置设在 C 点好于 B 点;
②车站的位置设在 B 点与 C 点之间公路上任何一点效果一样;
③车站位置的设置与各段小公路的长度无关.
![](https://img.xkw.com/dksih/QBM/2019/11/24/2340813855653888/2345002345472000/STEM/fe68e9a87a594aceb36689e33ca317de.png?resizew=113)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3edec6b3a624042e4295d9e709401b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d68c9c1649a2fedf11b5b6358a898e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf5be56d5a894d702dd6f6dc48600ff.png)
①车站的位置设在 C 点好于 B 点;
②车站的位置设在 B 点与 C 点之间公路上任何一点效果一样;
③车站位置的设置与各段小公路的长度无关.
![](https://img.xkw.com/dksih/QBM/2019/11/24/2340813855653888/2345002345472000/STEM/fe68e9a87a594aceb36689e33ca317de.png?resizew=113)
A.① | B.② | C.①③ | D.②③ |
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