1 . 洛阳九龙鼎位于河南省洛阳市老城区中州东路与金业路交叉口,是一个九龙鼎花岗岩雕塑,代表东周、东汉、魏、西晋、北魏、隋、唐、后梁、后唐9个朝代在这里建都,是洛阳的一座标志性建筑,九条龙盘旋的大石柱的顶端,端放着一座按1:1比例仿制的中国青铜时代的象征——西周兽面纹方鼎,汉白玉护栏两侧分别镶嵌着两幅《太极河图》.如图,为了测量九龙鼎的高度,选取了与该鼎底
在同一平面内的两个测量基点
与
,现测得
,在
点测得九龙鼎顶端
的仰角为
,在
点测得九龙鼎顶端
的仰角为
,则九龙鼎的高度
( )(参考数据:取
)
![](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/bc9bf4e813dec984e3629442dcca59ca.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/f1e5fa72f2878b476bc57f0df12d6555.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/58a42434d6481f624c3a33e7d1d6f14a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc099baccca62b5fccfdd9518ee23cfa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/03b9ab38-6b4b-4917-a9a0-eaf53c3c9575.png?resizew=139)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-06-14更新
|
709次组卷
|
6卷引用:青海省海东市2022-2023学年高一下学期6月联考数学试题
2 . 如图,某巡逻艇在A处发现正东方向30海里的B处有一艘走私船正沿东偏北
(
)的方向直线行驶,巡逻艇立即以走私船2倍的速度沿东偏北
(
)的方向直线追去,并在F处拦截.若点F在警戒水域
内(包含边界),则为安全拦截,否则为警戒拦截.已知B为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/69295a2e-e465-469d-9e48-aa97dddb67e1.png?resizew=216)
(1)若
,求
;
(2)若对任意的
都可以通过调整
的大小来实现安全拦截,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45c89d1cb5a4f758539bdda2e31fa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc282dae4ac9132196ac5d13f63b901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/69295a2e-e465-469d-9e48-aa97dddb67e1.png?resizew=216)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a40d2cf43fce0c99dff3470d554eb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f798a9af75a091a8be0b71f2038260.png)
(2)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5caabda288fc01cc168938846eec5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
2023-04-20更新
|
282次组卷
|
3卷引用:青海省海东市2022-2023学年高一下学期4月联考数学试题