如图所示,为测量河对岸的塔高
,选取了与塔底
在同一水平面内的两个测量基点
与
,现测得
,则塔高
为__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
23-24高一下·河南信阳·阶段练习 查看更多[2]
更新时间:2024-06-06 14:42:01
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【推荐1】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb66af66356b5d8418155f118b92b12d.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cea0cc79ff74240bd23ed24e438f8df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb66af66356b5d8418155f118b92b12d.png)
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【推荐2】在
中,角
、
、
所对的边分别为
、
、
,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c885e8032706feed854495e0f608aa04.png)
_______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】在
中,角
,
,
的对边分别为
,
,
,且
,
,则
的取值范围是________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302337058242c7b78e3eb4ac7210b7ce.png)
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【推荐2】如图,扇形
的圆心角为
,点
在弦
上,且
,延长
交弧
于点
,现向该扇形内随机投一点,则该点落在扇形
内的概率为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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【推荐1】如图,河的一侧是以点
为圆心,
米为半径的扇形区域
,河的另一侧有一建筑物
垂直于水平面、假设扇形
与点
处于同一水平面上,记
交
于点
.若在点
,
,
处看点
的仰角分别为45°,30°和60°,则
的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416f602447cd56bc0dcd5272096f6a56.png)
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【推荐2】校运动会开幕式上举行升旗仪式,旗杆正好处在坡度为15°的看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的仰角分别为60°和30°,第一排和最后一排的距离为
(如图所示),旗杆底部与第一排在一个水平面上,若国歌时长为50 s,升旗手应以________ m/s的速度匀速升旗.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67c819889220e3950286eba3f95fb8b.png)
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