某公司对办公大楼一块墙面进行如图所示的图案设计.这个图案由四个全等的直角三角形和一个小正方形拼接而成的大正方形,设小正方形的边长m,直角三角形较短边长n,且n=2m﹣4,大正方形的面积为S.
(1)求S关于m的函数关系式.
(2)若小正方形边长不大于3,当大正方形面积最大时,求m的值.
(1)求S关于m的函数关系式.
(2)若小正方形边长不大于3,当大正方形面积最大时,求m的值.
![](https://img.xkw.com/dksih/QBM/2020/6/11/2482120682430464/2484700283142144/STEM/32836bcd457f46eaaf97319c21df612f.png?resizew=131)
更新时间:2020-06-14 21:58:34
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【推荐1】用长为36米的篱笆围成一个矩形养鸡场,设围成矩形一边长为
米,面积为
平方米.
(1)求
关于
的函数解析式;
(2)当
为何值时, 围成的养鸡场面积为45平方米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图,一个横截面为抛物线形的公路隧道,其最大高度6米,底部宽度
为12米,现以O点为原点,
所在的直线为x轴建立直角坐标系.
(1)求这条抛物线的表达式;
(2)该隧道设计为双向通行道,如果规定车辆必须在中心线两侧、距离道路边缘2米的范围内行驶,并保持车辆顶部与隧道有不少于
米的空隙,则通过隧道车辆的高度限制应为_ 米;
(3)在隧道修建过程中,需要搭建矩形支架
(由三段组成)对隧道进行装饰,其中C、D在抛物线上,A,B在地面
上,求这个支架总长Z的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/0b26565e-a17c-427a-b18a-3638d71a5819.png?resizew=169)
(1)求这条抛物线的表达式;
(2)该隧道设计为双向通行道,如果规定车辆必须在中心线两侧、距离道路边缘2米的范围内行驶,并保持车辆顶部与隧道有不少于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)在隧道修建过程中,需要搭建矩形支架
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4b1ac1134286a5c6122ed68552e05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
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名校
【推荐1】如图,在四边形
中,
,
,
,
,
,点
从点
出发,沿射线
以每秒2个单位长度的速度向右运动,同时点
从点
出发,沿
方向以每秒1个单位长度的速度向点
运动.当点
到达点
时,点
停止运动,设点
运动时间为
秒.
(1)当运动停止时,求线段
的长;
(2)当t为何值时,四边形
为矩形,求出t的值和矩形
的面积;
(3)在运动的过程中,是否存在某一时刻
,使以
,
,
,
为顶点的四边形为平行四边形?若存在,请求出
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ad58997b9dc0b341c9af08f0cd1fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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(1)当运动停止时,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
(2)当t为何值时,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
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(3)在运动的过程中,是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图,在
中,
边上的高
,E、F分别
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/63a24d51-b588-441e-9fa5-23d905bc7469.png?resizew=196)
(1)求四边形
的面积;
(2)若
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2254fb31ef0929c336879b26007a8b8b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
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(1)求四边形
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(2)若
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【推荐3】综合与实践
情景再现:我们动手操作:把正方形
沿对角线剪开就分剪出两个等腰直角三角形,把其中一个等腰直角三角形与正方形
重新组合在一起,图形变得丰富起来,当图形旋转时,问题也随旋转应运而生.
如图①把正方形
沿对角线剪开,得两个等腰直角三角形
和
.
我们把剪下的两个三角形一个放大另一个缩小拼成如图②所示的图形
①若点P是平面内一动点,
,则线段
的取值范围是___________.
②直接写出线段
与
的关系是___________.
(2)我们把剪下的其中一个三角形放大与正方形组合如图③④⑤所示,点E在直线
上,
交直线
于M.
①当点E在
上时,如图③所示,求证:
;
②当点E在
的延长线时,如图④所示,则线段
具有的数量关系为___________;
当点E在
的延长线上时,如图⑤所示,则线段
具有的数量关系为___________;
(3)在(2)的条件下,连接
,当
,其他条件不变,则线段
的长为___________.
情景再现:我们动手操作:把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
如图①把正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
我们把剪下的两个三角形一个放大另一个缩小拼成如图②所示的图形
①若点P是平面内一动点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ddd92b1a227fc45763e01598e54650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
(2)我们把剪下的其中一个三角形放大与正方形组合如图③④⑤所示,点E在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9d3d08ffb5bd4afdc6ea1c47855686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
①当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0562d9b6ca2dc178a52d296fc92f7cda.png)
②当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6a457cf40438cb265e21700117ae9f.png)
当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c6a457cf40438cb265e21700117ae9f.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c473d421ef73a9c5d46a5f96af244e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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