小明同学在数学实践活动课上对学校一办公大楼进行实地测量,如图,此办公大楼正前方有一根高度是13米的旗杆
,从办公楼顶端A测得旗杆顶端E的俯角α是
,旗杆底端D到大楼前斜坡底部点C的距离是21米,斜坡的坡长
是13米,斜坡
的坡度
.
(2)求办公大楼
的高度.(精确到0.1米,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4dd80daefa23a61d300a829f77bbfa4.png)
(2)求办公大楼
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
更新时间:2023-05-08 08:39:24
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相似题推荐
解答题-作图题
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适中
(0.65)
名校
【推荐2】如图,在
中,
,
于点D,
于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/79dc21ec-76bb-4dbe-b5a4-f78fe8744639.png?resizew=131)
(1)依题意补全图形,猜想
与
之间的数量关系并证明;
(2)用等式表示线段
,
,
的数量关系;并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/79dc21ec-76bb-4dbe-b5a4-f78fe8744639.png?resizew=131)
(1)依题意补全图形,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】在平面直角坐标系中,点
为坐标原点,抛物线
交
轴负半轴于点
,交
轴正半轴于点
,交
轴于点
,且
.
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699678655799296/2702344993456128/STEM/402241b3-85cc-461e-829d-bd7b2983dc3a.png)
(1)求这个抛物线的解析式;
(2)如图1,点
为第三象限抛物线上的点,设点
的横坐标为
,
面积
,求
与
的函数解析式(直接写出自变量
的取值范围);
(3)如图2,在(2)的条件下,
为
延长线上的一点,若
到
轴的距离为
,
的面积为
,且
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9985ad1358d0fddcb8bfc99deb95bf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cbf4a0b81b41ba29296e3ea58e1e17.png)
![](https://img.xkw.com/dksih/QBM/2021/4/14/2699678655799296/2702344993456128/STEM/402241b3-85cc-461e-829d-bd7b2983dc3a.png)
(1)求这个抛物线的解析式;
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57124599d0a72bf788f08ce442a85600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e705de89b12d92bfe47a88a8d201db6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知:如图,
,
,
,
.点P在线段
上,连接
,过点D作
的垂线,与
相交于点C.设线段
的长为x.
(1)当
时,求线段
的长;
(2)设
的面积为y,求y关于x的函数解析式,并写出函数的定义域;
(3)当
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/b1b8e508-b0cf-4afa-a234-ec1e40532574.png?resizew=311)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd50cf631e459b58b180cdf2f57844c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed86cdabb478f2995620adb997d1982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,点
在同一条直线上,且
,过点
分别作
,
,
,连结
,
.
(1)求证:
.
(2)设
与
交于点
,若
,
,求点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf43052345f07e94b3fd253ad9efbbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3b7c004ab8913e7bb3bbfa9f9968f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9521effc99744da7d1445af9681a3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2b8b95de0e8fb7bf09c710ffe8a2e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3796f46a7983b6ac8a29bf0b2a47d45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783a91d42cadcf85eff20700bbdc6c6d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7308135fda2e4b9b16457b6aa12df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f5c775fe0ca1e5b432a6632de2b11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/2020/8/23/2534025182429184/2541010959638528/STEM/39fe8437-9e74-4eb7-99fa-2507c027c517.png?resizew=277)
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解答题-问答题
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适中
(0.65)
【推荐2】图l、图2均为8×6的方格纸(每个小正方形的边长均为1),在方格纸中各有一条线段AB,其中点A、B均在小正方形的顶点上,请按要求画图:
![](https://img.xkw.com/dksih/QBM/2018/1/2/1851967301402624/1858305811447808/STEM/d87530ee55ec49ffbbc2c4e9edd06ae2.png?resizew=378)
(1)在图l中画一直角△ABC,使得tan∠BAC=
,点C在小正方形的顶点上;
(2)在图2中画一个□ABEF,使得□ABEF的面积为图1中△ABC面积的4倍,点E、F在小正方形的顶点上.
![](https://img.xkw.com/dksih/QBM/2018/1/2/1851967301402624/1858305811447808/STEM/d87530ee55ec49ffbbc2c4e9edd06ae2.png?resizew=378)
(1)在图l中画一直角△ABC,使得tan∠BAC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(2)在图2中画一个□ABEF,使得□ABEF的面积为图1中△ABC面积的4倍,点E、F在小正方形的顶点上.
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解答题-问答题
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适中
(0.65)
【推荐1】如图,某人在山坡坡脚
处测得电视塔尖点
的仰角为
沿山坡向上走到
处再测得点
的仰角为
,已知
米,山坡坡度为
(即
),且
,
,
在同一条直线上.求电视塔
的高度及人所在位置点
的铅直高度.(测倾器的高度忽略不计,结果保留根号形式)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2634b010dd87a83c6825299fa5e2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099e4fb8027fee3e353bc3822bac572f.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/96f9bbb7-13ba-4185-8a32-989cf10db86c.png?resizew=192)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,一段河堤的斜坡
,为了加固河堤,需要将堤坝加厚.竣工后,斜坡的坡度由原来的
变成
,加固后斜坡
的长是多少?(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614c45b20f915ed6975e41a6ed23e3e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5881f1ce9b4172ca346032d0fd1e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/4e0e1e7e-a48f-4ce2-8c24-2bc4a0b5d2b6.png?resizew=271)
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