某校数学课题学习小组在“测量教学楼高度”的活动中,甲,乙两个小组分别设计了以下测量方案:
请你选择其中的一种测量方案,求教学楼的高度
.
课题 | 测量教学楼的高度 | |
测量小组 | 甲组 | 乙组 |
测量示意图 |
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测量说明 | ![]() ![]() ![]() ![]() | ![]() ![]() ![]() ![]() |
测量数据 | ![]() ![]() ![]() | ![]() ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
更新时间:2024-03-29 16:51:42
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解答题-问答题
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适中
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【推荐1】如图,某建筑物BC上有一旗杆AB,小明在F处,由E点观察到旗杆顶部A的仰角为52°,底部B的仰角为45°,小明的观测点与地面距离EF为1.6m,
(1)若F与BC相距12m,求建筑物BC的高度;
(2)若旗杆AB长3.15m,求建筑物BC的高度.(结果精确到0.1m)(参考数据:
≈1.414 sin52°≈0.788,tan52°≈1.280).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/54e43e57-3ab7-4a7d-91ec-fc85600d0817.png?resizew=149)
(1)若F与BC相距12m,求建筑物BC的高度;
(2)若旗杆AB长3.15m,求建筑物BC的高度.(结果精确到0.1m)(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐2】如图,已知直线
与
轴,
轴分别交于点
,
,与直线
交于点
.点
从点
出发以每秒1个单位的速度向点
运动,运动时间设为
秒.
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399472065257472/2399623625162753/STEM/301e41eb1af24a8b930ff0480ebd60e9.png?resizew=106)
(1)求点
的坐标;
(2)求下列情形
的值;
①连结
,
把
的面积平分;
②连结
,若
为直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b098e17fa76c648424e9cadf558cc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399472065257472/2399623625162753/STEM/301e41eb1af24a8b930ff0480ebd60e9.png?resizew=106)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求下列情形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
②连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9dc427a01582ec222446b352d40ab0d.png)
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【推荐1】如图,校园内有块三角形土地
,测得
,
,
米.学校准备向边
的外围拓展得到三角形地块
,要求点
,
,
在同一条直线上,且
,求
的长度.参考数据:
,
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acd45dfec968dabbe9f7b6499b9de0f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08bcb07c6b210eb418ca2b9e7cc81b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c070b66bd9255b8117a5896e56f05f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808edecb052cae4a5deb0f37602d95f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
![](https://img.xkw.com/dksih/QBM/2021/5/13/2720366910767104/2726708062699520/STEM/98448aad-0a5f-4c1c-b072-5b86bc20c4c4.png)
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真题
【推荐2】如图,地面上两个村庄C、D处于同一水平线上,一飞行器在空中以6千米/小时的速度沿MN方向水平飞行,航线MN与C、D在同一铅直平面内.当该飞行器飞行至村庄C的正上方A处时,测得∠NAD=60°;该飞行器从A处飞行40分钟至B处时,测得∠ABD=75°.求村庄C、D间的距离(
取1.73,结果精确到0.1千米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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