山西某地充分利用地理优势,大力推动乡村风电建设.如图,与斜坡
的坡顶
在同一水平面上建一台高为
的风力发电机,某综合实践活动小组在坡顶
处测得该风力发电机的顶端
的仰角为
,在斜坡底部
处测得该风力发电机的顶端
的仰角为
,测得坡长
为
,已知斜坡
的坡度为
,
,
.求风力发电机
的高度.(结果精确到
,参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/b097b2201d8aa335e20b9d2260dfe5ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a404e4d6514d46ce89b7f83e95b30916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f20b9c255e5830576860c40b06ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55cb039ee38520b9a2dae02000a8303c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d10178f7d0ba965a5c072d27ddf96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e668c90555fdb5cd289eefa28f9a4df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c0be1f2673d7f1198480c28a4804633.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/3/2e8c4384-84fb-476d-bd40-53774ca76ab4.png?resizew=191)
更新时间:2024-02-03 16:14:01
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知
是
的直径,
是
的切线,C是
上的点,
,M是直径
上的动点,A与直线
上的点的连线距离的最小值为d,B与直线
上的连线距离的最小值为f.
(1)求证:
是
切线.
(2)设
,求
的正切值.
(3)设
,
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/1/77a01a83-c7b7-48a9-8247-f507f77850ef.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8c54ba41d90541c55a9314ceddc5c62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4861f542d231b95d9833728d5f0a4005.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348216467fda035329fe8fac46b39911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dd90bfa2987b84df430498021d5f648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b9a2a5c13d164dd66a0b4ca8998c41.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在矩形
中,O是对角线
中点.过O点的直线与矩形的一组对边
,
分别相交于点F,E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/db996989-5791-4101-9922-f49f32a924bb.png?resizew=186)
(1)求证:
;
(2)点
与B关于直线
对称,连接
.
①求证:
;
②若
,且四边形
是平行四边形,求线段
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/db996989-5791-4101-9922-f49f32a924bb.png?resizew=186)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c502b3f22fab431264a3721b4f53f1a.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a452233432a882dffc39135ef234bd.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bacdeab3ad2d84ce6a3301946c61e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a862ee54fc0f3569fdc1d6eb359ec44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-作图题
|
适中
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【推荐1】在如图的菱形网格图中,每个小菱形的边长均为
个单位,且每个小菱形内角中的锐角为60°.
(1)直接写出
的三个顶点
的坐标;
(2)在图中作出
以点
为旋转中心,沿顺时针方向旋转60°后的图形
;
(3)根据(2),请直接写出线段
扫过的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(2)在图中作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacfc149ede71417fa599c21b5a84cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c3135fa20c32d04a270750f77c1f2d.png)
(3)根据(2),请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/3d66ee88-3c6f-4dda-83b5-412dc768455b.png?resizew=270)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,点O是斜边AC的中点,过点O作
,交AB于点E,过点A作AD
BC,与BO的延长线交于点D,连接CD、DE.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2892269839998976/2949357304823808/STEM/e74caf88-4aa1-46b4-ac5e-17f90e8a3068.png?resizew=283)
(1)求证:四边形ABCD是矩形;
(2)若
,
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b836a0f9c491f85767e8f6695576fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/1/2892269839998976/2949357304823808/STEM/e74caf88-4aa1-46b4-ac5e-17f90e8a3068.png?resizew=283)
(1)求证:四边形ABCD是矩形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ffea6a8170fa841837fdec449ef06d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
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解答题-问答题
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名校
【推荐1】数学兴趣小组的同学想要测量一楼房
的高度,如图,楼房
后有一假山,假山坡脚C与楼房水平距离为15米,其斜坡
坡度为
,山坡坡面上点E处有一休息亭,一名同学从坡脚C处出发沿山坡走了20米达到凉亭E,在A处测得E的俯角为
.
(2)求楼房
的高.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
(2)求楼房
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】小楠家附近的公路上通行车辆限速为60千米/小时.小楠家住在距离公路50米的居民楼(如图8中的P点处),在他家前有一道路指示牌MN正好挡住公路上的
段(即点P、M、N和点P、N、B分别在一直线上),已知MN∥AB,∠MNP=30°,∠NMP=45°,小楠看见一辆卡车通过A处,
秒后他在B处再次看见这辆卡车,他认定这辆卡车一定超速,你同意小楠的结论吗?请说明理由. (参考数据:
≈1.41,
≈1.73)
![](https://img.xkw.com/dksih/QBM/2012/1/20/1573332211539968/1573332340473856/STEM/1dffab77d1e743deada25a3b8012132e.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2012/1/20/1573332211539968/1573332340473856/STEM/e1d8159c0c7c43dfac87f452c7da3ab8.png?resizew=13)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2012/1/20/1573332211539968/1573332340473856/STEM/9cbede0755ed486c9bf61d1c6e7b0097.png?resizew=230)
您最近一年使用:0次
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名校
【推荐3】在“停课不停学”期间,小明用电脑在线上课,图1是他的电脑液晶显示器的侧面图,显示屏
可以绕
点旋转一定角度.研究表明:当眼睛
与显示屏顶端
在同一水平线上,且望向显示器屏幕形成一个18°俯角,即望向屏幕中心
的视线
与水平线
的夹角
时,对保护眼睛比较好,而且显示屏顶端
与底座
的连线
与水平线
垂直时(如图2)时,观看屏幕最舒适,此时测得
,
,液晶显示屏的宽
为
.
与显示屏顶端
的水平距离
.(结果精确到
)
(2)求显示屏顶端
与底座
的距离
.(结果精确到
)(参考数据:
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bd4b59a97f9af375b58a22316f2c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ffd53c05d7a535030ab6a0c129d0d5.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfac9ab1dc776c9ec076ab2a132fcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3599885b5d5ab4c2e2ce9614701b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3668a3f3ce5b8a272ad92c2ebd233f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
(2)求显示屏顶端
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77b8ef50678b8ad3bc0b7fdf0317f13d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b2d3e87a5af5970868b4c46ce6e029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec09abdb99f49aeed83a99489da85e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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解答题-应用题
|
适中
(0.65)
名校
【推荐1】甲、乙两人去登山,甲从小山西边山脚B处出发,已知西面山坡的坡度
(坡度:坡面的垂直高度与水平长度的比,即
).同时,乙从东边山脚C处出发,东面山坡的坡度
,坡面
米.
.
(2)已知甲每分钟比乙多走10米.两人同时出发,并同时达到山顶A.求:甲、乙两人的登山速度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35127a581813883f6b313a7fdb651a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d5bc3d5613f3f5a16d49a18ea1b825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3a0fd4f0ed0b653ade142bcda7046f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7dccc5222820f20ddf2d3561bb1993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)已知甲每分钟比乙多走10米.两人同时出发,并同时达到山顶A.求:甲、乙两人的登山速度.
您最近一年使用:0次
解答题-问答题
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【推荐2】酷爱写诗的陈老师,某日到南山采风,结束后步行下山回家,发现下山路
为一条坡度为
的斜坡,在斜坡下端
处有一座塔,陈老师在
处测得塔顶
的俯角为
,沿斜坡前行
米到达
处,请根据以上条件求塔的高度
.(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf6101c529b7868bc1c2fd46aca16bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078e44b48eebf0e671ec889bd0d7ff8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
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