如图,在山脚A测得山顶P的仰角为
,沿倾斜角为
的斜坡向上走a米到B,在B处测得山顶P的仰角为
.
![](https://img.xkw.com/dksih/QBM/2011/5/27/1570225116495872/1570225121837056/STEM/da398483-138a-4cce-a182-0501f740a04b.png?resizew=263)
(1)求PA长度;
(2)证明:山高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://img.xkw.com/dksih/QBM/2011/5/27/1570225116495872/1570225121837056/STEM/da398483-138a-4cce-a182-0501f740a04b.png?resizew=263)
(1)求PA长度;
(2)证明:山高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46dc8fc447dbaebfdb6b73f51edfe61.png)
10-11高一下·黑龙江·期中 查看更多[1]
(已下线)2010-2011年黑龙江省哈六中高一第二学期期中考试数学
更新时间:2016-11-30 21:34:05
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【推荐1】已知
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(1)若点
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
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【推荐2】
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ee608882881caff2f1e223177424ac.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
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(2)若角A为锐角,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】某校运动会开幕式上举行升旗仪式,旗杆正好处在坡角为
的观礼台的某一列的正前方,从这一列的第一排和最后一排测得旗杆顶部B的仰角分别为
和
,第一排和最后一排的距离为
米(即图中线段
),旗杆底部与第一排在同一水平面上.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2992097769021440/2992802207555584/STEM/2a3d978a-dfcb-42de-ad64-99832473cb08.png?resizew=297)
(1)求旗杆长度;
(2)若国歌播放的时间约为50秒,升旗手应以约多大的速度匀速升旗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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(1)求旗杆长度;
(2)若国歌播放的时间约为50秒,升旗手应以约多大的速度匀速升旗?
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【推荐2】某烟花厂家为了测试最新研制出的一种“冲天”产品升空的安全性,特对其进行了一项测试.如图,这种烟花在燃放点
进行燃放实验,测试人员甲、乙分别在
两地(假设三地在同一水平面上),测试人员甲测得
两地相距
米,且
,甲听到烟花燃放“冲天”时的声音的时间比乙晚
秒.在
地测得该烟花升至最高点
处的仰角为
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米∕秒)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/61dbced4-8535-4fab-8056-1189dc3134eb.png?resizew=165)
(1)求甲与燃放点
的距离;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/61dbced4-8535-4fab-8056-1189dc3134eb.png?resizew=165)
(1)求甲与燃放点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)求这种烟花的垂直“冲天”高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
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