如图1是某工厂生产的某种多功能儿童车,根据需要可变形为滑板车或三轮车,图2、图3是其示意图,已知前后车轮半径相同,车杆
的长为
,点
是
的中点,前支撑板
,后支撑板
,车杆
与
所成的
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/28ac1384-a0e3-4e79-923c-0527043139f2.png?resizew=527)
(1)如图2,当支撑点
在水平线
上时,则支撑点E与前轮轴心
之间的距离
的长为______;
(2)如图3,当座板
与地面保持平行时,求变形前后两轴心
的变化量(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9871f2a312aaf3a19b40e4fb1a7693b.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/0929e4e5151c8f27a5486fc94bff9cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab50cb1ec4b578e948e5eaa2fdcbed41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f039e45e5feea00e957b49af46c68a0f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/28ac1384-a0e3-4e79-923c-0527043139f2.png?resizew=527)
(1)如图2,当支撑点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)如图3,当座板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fe9cc87f8e8389c94efa7e7caab2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad548d3bb499aab6d0baf4032be99bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
2023·河北·模拟预测 查看更多[2]
更新时间:2023-04-14 18:34:17
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在
的边
上取一点
,以
为圆心,
为半径画
,
与边
相切于点
,连接
,
平分
.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938747955888128/2941144369438720/STEM/e225b804ae254011a51d936f7feb9b4a.png?resizew=183)
(1)求证:
是
的切线;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938747955888128/2941144369438720/STEM/e225b804ae254011a51d936f7feb9b4a.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e071479287e774f7f0990b1a649658f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,四边形
内接于⊙O,
为直径,点C是
的中点,过点C作⊙O的切线交
的延长线于点H,作
,垂足为E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/770b291e-990e-41a2-85fb-ffeab4db69b9.png?resizew=121)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/770b291e-990e-41a2-85fb-ffeab4db69b9.png?resizew=121)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f86d9ca130443b8effd507f50364c6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce5ddda45b900d2a3491e39c169d45c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3064b70f24e9bbcab76e0dc61274b9b.png)
您最近一年使用:0次
解答题-应用题
|
适中
(0.65)
【推荐1】如图,在坡顶
处的同一水平面上有一建筑
,在斜坡底
处测得该建筑顶点
的仰角为
,然后他们沿着坡度为
的斜坡
攀行了
米到达坡顶,在坡顶
处又测得该建筑的顶点
的仰角为
.
到地面的距离;
(2)求该建筑
的高度.(结果精确到
米.参考数据:
,
,
)
![](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/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/f506e1c5584ae3c4d287c49f75a752dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5453184e251cfe787b5965cd38426962.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/9c5b696c0ca68ec19b9127c1675051f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求该建筑
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8200c0165046ed9996024cc5bc1e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4134aff9a03de7d5ec66770e4260ca6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ec253c1b5812546185f4ab6e9db1.png)
您最近一年使用:0次
【推荐2】如图,在
中,
,高
,正方形
一边在
上,点
分别在
上,
交
于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知点
、
分别在
中的边
、
的延长线上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/e897bd2d-d2e4-407b-be13-bad32665883d.png?resizew=225)
(1)如果
,
,
,求
的长;
(2)如果
,
,
,过点
作
,垂足为点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/e897bd2d-d2e4-407b-be13-bad32665883d.png?resizew=225)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905c7dbd4a489c232f4c7ceb05479ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b39e39696825a18c8cd16c351029a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af69ccd4919a013c5a5b46ebe5cfc0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86afd4f2661a9208c4e600e318408777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】图1是某酒店的推拉门,已知门的宽度AD=2米,两扇门的大小相同(即AB=CD),且AB+CD=AD,现将右边的门CDD1C1绕门轴DD1向外面旋转67°(如图2所示).
![](https://img.xkw.com/dksih/QBM/2019/6/27/2234423995203584/2235374862934017/STEM/3e9bdc88a9c64532b427f59b05e7cf20.png?resizew=447)
参考数据:(sin67°≈0.92,cos67°≈0.39,tan29.6°≈0.57,tan19.6°≈0.36,sin29.6°≈0.49)
(1)求点C到直线AD的距离.
(2)将左边的门ABB1A1绕门轴AA1向外面旋转,设旋转角为a(如图3所示),问当a为多少度时,点B,C之间的距离最短.
![](https://img.xkw.com/dksih/QBM/2019/6/27/2234423995203584/2235374862934017/STEM/3e9bdc88a9c64532b427f59b05e7cf20.png?resizew=447)
参考数据:(sin67°≈0.92,cos67°≈0.39,tan29.6°≈0.57,tan19.6°≈0.36,sin29.6°≈0.49)
(1)求点C到直线AD的距离.
(2)将左边的门ABB1A1绕门轴AA1向外面旋转,设旋转角为a(如图3所示),问当a为多少度时,点B,C之间的距离最短.
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解答题-证明题
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适中
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真题
名校
【推荐1】问题探究:
1.新知学习
若把将一个平面图形分为面积相等的两个部分的直线叫做该平面图形的“面线”,其“面线”被该平面图形截得的线段叫做该平面图形的“面径”(例如圆的直径就是圆的“面径”).
2.解决问题
![](https://img.xkw.com/dksih/QBM/2016/8/3/1574222674665472/1574222680752128/STEM/f825218c11d74a28af705716c495ff8a.png)
已知等边三角形ABC的边长为2.
(1)如图一,若AD⊥BC,垂足为D,试说明AD是△ABC的一条面径,并求AD的长;
(2)如图二,若ME∥BC,且ME是△ABC的一条面径,求面径ME的长;
(3)如图三,已知D为BC的中点,连接AD,M为AB上的一点(0<AM<1),E是DC上的一点,连接ME,ME与AD交于点O,且S△MOA=S△DOE.
①求证:ME是△ABC的面径;
②连接AE,求证:MD∥AE;
(4)请你猜测等边三角形ABC的面径长l的取值范围(直接写出结果)
1.新知学习
若把将一个平面图形分为面积相等的两个部分的直线叫做该平面图形的“面线”,其“面线”被该平面图形截得的线段叫做该平面图形的“面径”(例如圆的直径就是圆的“面径”).
2.解决问题
![](https://img.xkw.com/dksih/QBM/2016/8/3/1574222674665472/1574222680752128/STEM/f825218c11d74a28af705716c495ff8a.png)
已知等边三角形ABC的边长为2.
(1)如图一,若AD⊥BC,垂足为D,试说明AD是△ABC的一条面径,并求AD的长;
(2)如图二,若ME∥BC,且ME是△ABC的一条面径,求面径ME的长;
(3)如图三,已知D为BC的中点,连接AD,M为AB上的一点(0<AM<1),E是DC上的一点,连接ME,ME与AD交于点O,且S△MOA=S△DOE.
①求证:ME是△ABC的面径;
②连接AE,求证:MD∥AE;
(4)请你猜测等边三角形ABC的面径长l的取值范围(直接写出结果)
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解答题-计算题
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【推荐2】如图1是一张折叠椅子,图2是其侧面示意图,已知椅子折叠时长1.2米,椅子展开后最大张角∠CBD=37°,且BD=BC,AB:BG:GC=1:2:3,座面EF与地面平行,当展开角最大时,请解答下列问题:
(1)求∠CGF的度数;
(2)求座面EF与地面之间的距离.(可用计算器计算,结果保留两个有效数字,参考数据:sin71.5°≈0.948,cos71.5°≈0.317,tan71.5°≈2.989
(1)求∠CGF的度数;
(2)求座面EF与地面之间的距离.(可用计算器计算,结果保留两个有效数字,参考数据:sin71.5°≈0.948,cos71.5°≈0.317,tan71.5°≈2.989
![](https://img.xkw.com/dksih/QBM/2014/7/1/1573736665505792/1573736671453184/STEM/a91e581c12e6447cbbeb2016eb1e13d0.png)
您最近一年使用:0次