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2020·内蒙古呼伦贝尔·中考真题 查看更多[4]
内蒙古呼伦贝尔市2020年数学中考试题(已下线)第29讲 锐角三角函数 (讲练)-2021年中考数学一轮复习讲练测2023年内蒙古呼伦贝尔市鄂伦春自治旗中考一模数学模拟试题2023年3月山东省泰安市泰山实验中学九年级中考数学模拟预测题
更新时间:2020-08-12 17:30:17
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【知识点】 方位角问题(解直角三角形的应用)
相似题推荐
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名校
【推荐1】如图,四边形
是某城市的休闲步道,小明家在点
处,点
处是超市,点
处是公园,点
处是书店.经测量,点
在
的正南方向,点
在
的西南方向,点
在
的正西方向,
米,
米,点
在点
的北偏西
方向上.
的长度(精确到个位);
(2)周末,小明和父亲在公园
处晨练,结束后两人同时步行回家,已知:小明速度为70米/分,沿
的方向行走,小明父亲速度为100米/分,沿
的方向行走,他们谁先到家?请说明理由.(结果精确到0.1,参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)周末,小明和父亲在公园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d311b8b003421d42aa6a3673d1e0baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a6be08c747b22834f1425c6253eebc.png)
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【推荐2】“愚公移山”是我国著名寓言故事,它告诉了我们坚持不懈的道理.某日,小张穿越至愚公的年代,碰到了移山的众人.
,
间的直线距离为
里(如图
所示).
线路
:折线
,已知点
在点
东北方向,点
在点
东偏南
方向,
,且
,
间的距离为
里;
线路
:以
为直径的半圆.
如果仅从远近考虑,小张应该告知愚公选取哪一条线路使得路程更短?请你通过计算说明理由.
(2)愚公为了能够更精确地了解所移之山
的高度,请求小张帮其测量.如图
所示,已知在山
的后方有一座高
米的小山
,小张站在线段
上的点
处,
米,此时小张测得点
的仰角为
,随后小张到达小山山顶点
处测得点
的仰角为
,请你帮小张求出山高
的值.(结果保留
位有效数字,以下为参考三角比与数值)
;
;
;
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
线路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51de5ca1c2879e7a767a60ce4624cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903c1bb6f9fe8f9b9710683a3e601452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
线路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
如果仅从远近考虑,小张应该告知愚公选取哪一条线路使得路程更短?请你通过计算说明理由.
(2)愚公为了能够更精确地了解所移之山
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e85c53a287e873f35c9ca64972023c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce2790947716b1cfa9c5e7a65db4093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480637ac65ca4ad1eef5b5fb622ec357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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