1 . 跑步机是家庭及健身房常备的健身器材,如图①是一款家用电动跑步机,图②是其侧面结构示意图,已知跑步机扶手
和踏板
所在平面平行,操作面板
与机架
之间的夹角为
,与扶手
之间的夹角为
,机架
的长为
米,踏板的厚度为
米,求扶手
与踏板之间的距离.
(精确到
米,参考数据:
,
,
)
![](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/e8faa67131a39f719be1871606b7927c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cde7aace5b888a1a1c26fb911e2f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64625c2f7ddbaac433707e139f7b91a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fef4da2afc6a61c7f23ff37f0392ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(精确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8065456efeb595b1ee723ed03029e0ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ecf1ef8d629f08050be24cd79b9abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50922f69519376f0655cc9db737d32c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688e008ebc2091f23e4e8ebb18a30486.png)
您最近一年使用:0次
2 . 敦煌首航100兆瓦熔盐塔式光热电站是“中国智慧”和“中国建设”的体现. 它的原理简单说就是利用镜面反射太阳光线,通过一个特殊的装置将太阳光转化成电能.随着太阳角度的变化,每个定日镜都不停自动调整角度,保持最佳的反射角度. 图2是反射示意图,由反射原理,入射光线与镜面的夹角
等于反射光线与镜面的夹角
.已知定口镜的长
为12米,点
为
中点,定日镜绕点
旋转,当入射光线与镜面的夹角为
度时,反射光线恰好照在吸热塔顶端
处. 此时镜面
与支撑柱
的夹角为60度,点B 到地面的距离
是5米,支撑柱到吸热塔底端的距离是500米.
)
(1)求支撑柱
的高度;
(2)求吸热塔
的高度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e3026c4e35dbfedd67de36f122bf5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/9a87126a28fb1813c20f39042d972d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a2d61255aa93a603e687b2868fba92.png)
(1)求支撑柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/782a7b8656a7ad52519d7f2079ed6114.png)
(2)求吸热塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e16f111913e27edaacf8a30e48ea640.png)
您最近一年使用:0次
2024-04-09更新
|
161次组卷
|
2卷引用:山东省临沂市蒙阴县蒙阴第三中学2023-2024学年九年级下学期期中数学试题
3 . 如图,直线
与
轴交于
点,与反比例函数
,过
作
轴于点
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16ea416dd171c5279967976f33c9840.png)
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/f175d947-0982-470f-b9fd-1f82dcf15956.png?resizew=147)
(1)求反比例函数表达式;
(2)点
是反比例函数
图象上的点,在
轴上是否存在点
,使得
最小?若存在,求出点
的坐标;若不存在,请说明理由;
(3)将直线
向下平移
个单位后与反比例函数
的图象交于一点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae342dcb93e0e6f017093cacc5ac977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcec4050ad922c18239c38effcc45403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16ea416dd171c5279967976f33c9840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6791541ab07d564d4707c3f2a00e0f7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/19/f175d947-0982-470f-b9fd-1f82dcf15956.png?resizew=147)
(1)求反比例函数表达式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72e2dd965f4a9d7aa504e997762cc70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae342dcb93e0e6f017093cacc5ac977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9940526785ca763da2dfa35e77c934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3298ea64dd252f475c5ba8d4f6c2f778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e341a1590281aea01a0cb1c1b1a71b.png)
您最近一年使用:0次
2023-11-21更新
|
177次组卷
|
3卷引用:山东省烟台市蓬莱区2023-2024学年九年级上学期期中数学试题
名校
4 . 当
为锐角,且
时,
的取值范围是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690bc26569bff11c5065a596ae18c367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
您最近一年使用:0次
2023-11-05更新
|
223次组卷
|
3卷引用:山东省龙口市(五四制)2023-2024学年上学期九年级期中数学试题
5 . 如图,一艘海轮位于灯塔
的北偏东
方向,距离灯塔
海里的
岛,它沿正南方向航行一段时间后,到达位于灯塔
的东南方向上的
岛,求
、
两岛之间的距离.(结果保留整数)【参考数据:
,
,
】
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2931e9bcd1cd5280d783ed6dda4ca38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d1950507c3bbc3e796089c97f71711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5e4a82905a21bb7bae8829bdc4f91a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bf3c92255b0d8feff453129d70ab17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/5a8361f3-043b-4342-b1c7-8287ac69c26f.png?resizew=131)
您最近一年使用:0次
2023-01-26更新
|
625次组卷
|
5卷引用:山东省聊城市东阿县2023-2024学年九年级上学期期中数学试题
6 . 【阅读理解】:如图,在
中,a,b,c分别是
,
,
的对边,
,其外接圆半径为
.根据锐角三角函数的定义:
,
,可得
,即
(规定
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/b28c483a-9992-4f74-9732-bdac1a7e79b9.png?resizew=125)
【探究活动】:如图,在锐角
中,a,b,c分别是
,
,
的对边,其外接圆半径为
,那么:
___________
___________
(用>,=或<连接),并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4d334b18-baa9-4f54-ae55-d5ece5f2c168.png?resizew=133)
【初步应用】:事实上,以上结论适用于任意三角形.在
中,a,b,c分别是
,
,
的对边.已知
,
,
,求
.
【综合应用】:如图,在某次数学实践活动中,小莹同学测量一栋楼
的高度,在
处用测角仪测得地面点
处的俯角为45°,点
处的俯角为15°,B,C,D在一条直线上,且C,D两点的距离为100m,求楼
的高度.(参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aef4ec0a3bb0fe551b74be20f650578.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9250a13b836e51e0b0514f2063424d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f14bf593ac79387cadcc523595aa84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30b12f8bf54428846cf378ffd5a23b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61400c4d8659862013490e0b829f2ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/b28c483a-9992-4f74-9732-bdac1a7e79b9.png?resizew=125)
【探究活动】:如图,在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1075d972439d6a0fbbc04cf439257d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688aa85d2d293b7a0677c32a46686bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7666e569aeea50f726fb694446fc0f72.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4d334b18-baa9-4f54-ae55-d5ece5f2c168.png?resizew=133)
【初步应用】:事实上,以上结论适用于任意三角形.在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b173ac8cc4ac4f1c9e1daaa605fbb27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71812e0762c0aaffb51cfef66156567.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
【综合应用】:如图,在某次数学实践活动中,小莹同学测量一栋楼
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc9d29fec4b1672808d4961479f09d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/ac3fd473-a0ee-43e9-8a43-d09b5fa9e876.png?resizew=318)
您最近一年使用:0次
2022-12-06更新
|
293次组卷
|
4卷引用:山东省潍坊市潍城区2022-2023学年九年级上学期期中数学试题
7 . 如图中是抛物线形拱桥,P处有一照明灯,水面
宽
,从O、A两处观测P处,仰角分别为
、
.且
,
,以O为原点,OA所在直线为x轴建立直角坐标系.若水面上升
,水面宽为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7854968bbf6576a1fd9926ee0d4d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef966cdd137b3b10e290201b4d17542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db4a2dda730d3070f5e30ccdccaf7ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6563eb699f1bbc39eced661a2ebfcce4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/8f7adc38-026b-457c-a0b3-9893815519aa.png?resizew=206)
您最近一年使用:0次
8 . 如图,在正方形
中,E,F分别是
,
的中点,
交
于点H,
交
于点G,下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/86ff48da-1588-4ce2-b633-f3b1753feedf.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc727d622518dc879d66f886a61c20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/86ff48da-1588-4ce2-b633-f3b1753feedf.png?resizew=165)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 在
中,a,b,c分别是
的对边,
,下列各式不一定成立的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8551fd9f84d6873051bde12ecb791596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-11-02更新
|
148次组卷
|
3卷引用:山东省潍坊市青州市2022-2023学年九年级上学期期中数学试题
真题
名校
10 . 如图,抛物线
交x轴于点
和
,交y轴于点C.
(2)D是直线
上方抛物线上一动点,连接
交
于点N,当
的值最大时,求点D的坐标;
(3)P为抛物线上一点,连接
,过点P作
交抛物线对称轴于点Q,当
时,请直接写出点P的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2b1f4120365cb6ee4925fe417563f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e30645f36e8628b9e25d53598d5174.png)
(2)D是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3ab0c9701afa249220bf3e61eee40a.png)
(3)P为抛物线上一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f000c53640cd90ae54bf114dbc6e8a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e71ba9aae096ce21671e731c271495.png)
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2022-07-05更新
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18卷引用:山东省淄博市淄博高新区实验中学2023-2024学年九年级上学期期中数学试题
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