2023年的政府工作报告中传递出文旅发展新动态,陕西某市政府积极响应,对辖区内的景点设施和交通等硬件进行改造和升级,提升消费者的满意程度.如图,该区有A,B,C,D四个景点,景点A,D,C依次在东西方向的一条直线上,景点B在景点D的正北方向,且景点C与景点D的距离为
,现有公路
,
,
,
,已知
,
.
(1)求公路
的长度;
(2)市政府准备在景点C,B之间修一条互通大道(即线段
),并在大道
上的E处修建一座凉亭方便游客休息,同时D,E之间也修建一条互通大道(即线段
),且
.若修建互通大道
,
的费用均是每千米17万元,请求出修建互通大道
,
的总费用是多少万元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f971d44effe601c7244f7bcde43b863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dcfcb3705b261cdaa2291515d921fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6bdca729222cd8fe0aea6fd602a86fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/8fe1a930-de34-4ff0-80e3-8f33b75cd18c.png?resizew=212)
(1)求公路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)市政府准备在景点C,B之间修一条互通大道(即线段
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2023-09-28 08:04:27
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【推荐1】如图,在
中,
,
,
,
![](https://img.xkw.com/dksih/QBM/2023/10/7/3341018728177664/3341807518072832/STEM/6f924ba063204c16a5a88ffa9530a828.png?resizew=167)
(1)求
的长;
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4d19138d20f23466dd49136e464bad2.png)
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![](https://img.xkw.com/dksih/QBM/2023/10/7/3341018728177664/3341807518072832/STEM/6f924ba063204c16a5a88ffa9530a828.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
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【推荐2】已知
是等腰直角三角形,
,点D是平面内任意一点,
绕着点C逆时针旋转
到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/4de33d8f-e118-407f-90f8-6160618883b0.png?resizew=360)
(1)如图①,若D为
内一点,求证:
;
(2)如图②,若D为
边上一点,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/4de33d8f-e118-407f-90f8-6160618883b0.png?resizew=360)
(1)如图①,若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
(2)如图②,若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fce5213a60bbc69a8e6979d70f9e15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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【推荐1】为响应国家的“节能减排”政策,某厂家开发了一种新型的电动车,如图,
与地面
的夹角分别为
和
,
,大灯照亮地面的宽度
的长为
.(参考数据:
,
,
)
(1)求
的长(不考虑其他因素);
(2)我们设定从发现危险(大灯照到)到电动车完全停下所行驶的距离叫做最小安全距离.厂家测试中发现,一般正常人从发现危险到做出刹车动作的反应时间是
,且该车以
的速度做出刹车动电动车停止的刹车距离为
,请判断该车大灯的设计是否能满足最小安全距离的要求(大灯与前轮前端间水平距离为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01f8039a874d818f0067ad4dc93bdd33.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de19f9997122102c771ead5c09a143a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a76135278ea1c0c8d66b65c020f59a0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/0f368781-3f14-49af-ba81-8cade3d81dbd.png?resizew=218)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
(2)我们设定从发现危险(大灯照到)到电动车完全停下所行驶的距离叫做最小安全距离.厂家测试中发现,一般正常人从发现危险到做出刹车动作的反应时间是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a524a5c15f60b133b49523fd070f9331.png)
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