如图,小明为了测量小河对岸大树
的高度,他在点A处(点G、A、C在同一水平线上)测得大树顶端B的仰角为
,沿着坡度
的斜坡
走6米到达斜坡上点D处,此时测得大树顶端B的仰角为
,点A、B、C、D在同一平面内.
(1)填空:
,
;
(2)求斜坡上点D到
的距离;
(3)求大树
的高度(结果精确到0.1米.参考数据:
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df98c7b41e565f2f1f0b36fb98cfe3bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7451b9d94e28503b8ac931632ff9dbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/86a54bd8-04d4-441d-9884-7cbe07df0366.png?resizew=230)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb5b319c717586a3ad3d39c873d69bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb663fe83b1f7e93e13d91cc6460f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)求斜坡上点D到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(3)求大树
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9276f5c80582d75a9731f68947c5d08f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a91fa163ba018df2dcf31e86f10180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c114c8734f0d064de64d8457655a980c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
2023·海南海口·一模 查看更多[5]
2023年海南省海口市中考一模数学试题(已下线)2023年浙江省嘉兴(舟山)市中考数学真题变式题21-24题四川省泸州市合江县教育发展研究中心2023-2024学年九年级上学期期末数学试题安徽省 六安市 舒城县2023-2024学年九年级上学期期末数学试题江苏省常州市新北区河海实验学校2023-2024学年九年级上学期第二次月考数学试题
更新时间:2023-05-15 10:25:15
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解题方法
【推荐1】如图,平台AB高为12m,在B处测得楼房CD顶部点D的仰角为45°,底部点C的俯角为30°,求楼房CD的高度(
=1.7).
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【推荐2】如图是小明洗漱时的侧面示意图,洗漱台(矩形
)靠墙摆放,高
,宽
,小明身高
,下半身
,洗漱时下半身与地面的夹角为
,上半身前倾与水平面的夹角为
,脚与洗漱台距离
(点D,C,G,K在同一直线上).小明希望他的头部E恰好在洗漱盆
的中点O的正上方,他应向前或后退多少cm?(
,
,
,结果精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd57877280c05f15d63c1fef2f65f667.png)
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![](https://img.xkw.com/dksih/QBM/2022/4/23/2964596609622016/2967363578937344/STEM/db5ee5c0-9dde-4be6-a095-ae3ce1048796.png?resizew=170)
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【推荐3】【阅读材料】某校九年级数学课外兴趣探究小组在学习完《第二十八章锐角三角函数》后,利用所学知识进行深度探究,得到以下正确的等量关系式:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb914891829fa04e3a78234d18763d20.png)
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab168d675144caf12e354dba6b7c696.png)
,
,
【理解应用】请你利用以上信息求下列各式的值:(1)
;(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad662934f4ccb1f7b152004ca585809.png)
【拓展应用】(3)为了求出海岛上的山峰
的高度,在
处和
处树立标杆
和
,标杆的高都是3丈,
两处相隔1000步(1步等于6尺),并且
和
在同一平面内,在标杆
的顶端
处测得山峰顶端
的仰角75°,在标杆
的顶端
处测得山峰顶端
的仰角30°,山峰的高度即
的长是多少步?(结果保留整数)(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e2a86ab434957184bd52bb9a38b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb914891829fa04e3a78234d18763d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b19107b99675eb8a75b374e79e14db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab168d675144caf12e354dba6b7c696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a4b5c5ad3c4cc369d573cc61e9739e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb45a6b3a3c922457747948da3c00f9.png)
【理解应用】请你利用以上信息求下列各式的值:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d8912c05e321b9767802ef328c401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad662934f4ccb1f7b152004ca585809.png)
【拓展应用】(3)为了求出海岛上的山峰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐1】已知:如图,斜坡PQ的坡度i=1∶
,在坡面上点O处有一根1m高且垂直于水平面的水管OA,顶端A处有一旋转式喷头向外喷水,水流在各个方向沿相同的抛物线落下,水流最高点M比点A高出1m,且在点A测得点M的仰角为30°,以O点为原点,OA所在直线为y轴,过O点垂直于OA的直线为x轴建立直角坐标系.设水喷到斜坡上的最低点为B,最高点为C.
(1)写出A点的坐标及直线PQ的解析式;
(2)求此抛物线AMC的解析式;
(3)求|xC-xB|;
(4)求B点与C点间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)写出A点的坐标及直线PQ的解析式;
(2)求此抛物线AMC的解析式;
(3)求|xC-xB|;
(4)求B点与C点间的距离.
![](https://img.xkw.com/dksih/QBM/2018/8/16/2011766240813056/2014493334732800/STEM/2194ba7290734c6c94cc2862e1f1a883.png?resizew=253)
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【推荐2】为打造旅游休闲城市,某村庄为吸引游客,沿绿道旁的母亲河边打造喷水景观(如图1).为保持绿道地面干燥,水柱呈抛物线状喷入母亲河中.图2是其截面图,已知绿道路面宽
米,河道坝高
米,坝面AB的坡比为
(其中
),当水柱离喷水口O处水平距离为2米时,离地平面距离的最大值为3米.
(1)求水柱所在抛物线的解析式;
(2)出于安全考虑,在河道的坝边A处安装护栏,若护栏高度为1.2米,判断水柱能否喷射到护栏上,说明理由;
(3)河中常年有水,但一年中河水离地平面的距离会随着天气的变化而变化,水柱落入水中能荡起美丽的水花,从美观角度考虑,水柱落水点要在水面上;
①河水离地平面
距离为多少时,刚好使水柱落在坝面截线
与水面截线的交点处?
②为保证水柱的落水点始终在水面上,决定安装可上下伸缩的喷水口,设坝中水面离地平面距离为h米,喷水口离地平面的最小高度m随着h的变化而变化,直接写出m与h的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d257ee9c4cc6734d6133176abfc1404.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff3af2c91247039ef53ae46a88f0109.png)
(1)求水柱所在抛物线的解析式;
(2)出于安全考虑,在河道的坝边A处安装护栏,若护栏高度为1.2米,判断水柱能否喷射到护栏上,说明理由;
(3)河中常年有水,但一年中河水离地平面的距离会随着天气的变化而变化,水柱落入水中能荡起美丽的水花,从美观角度考虑,水柱落水点要在水面上;
①河水离地平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②为保证水柱的落水点始终在水面上,决定安装可上下伸缩的喷水口,设坝中水面离地平面距离为h米,喷水口离地平面的最小高度m随着h的变化而变化,直接写出m与h的关系式.
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