一块材料的形状是锐角三角形
,下面分别对这块材料进行课题探究:
课本再现:
(1)在图1中,若边
,高
,把它加工成正方形零件,使正方形的一边在
上,其余两个顶点分别在
,
上,这个正方形零件的边长是多少?
(2)如图2,若这块锐角三角形
材料可以加工成3个相同大小的正方形零件,请你探究高
与边
的数量关系,并说明理由.
拓展延伸
(3)①如图3,若这块锐角三角形
材料可以加工成图中所示的4个相同大小的正方形零件,则
的值为_______(直接写出结果);
②如图4,若这块锐角三角形
材料可以加工成图中所示的
相同大小的正方形零件,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
课本再现:
(1)在图1中,若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf57eef2bac6f23b54d87bd128fac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b268b2129e91d0af3423f2c001653d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,若这块锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
拓展延伸
(3)①如图3,若这块锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606ff826406d9fc8403d365762cd9e4c.png)
②如图4,若这块锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563fa707c1137ab36ea99c1f00a39f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606ff826406d9fc8403d365762cd9e4c.png)
更新时间:2024-05-20 05:22:09
|
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上一个动点,点
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、
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】综合与实践:
【问题情境】:通过查看出厂包装袋上的数据,数学活动小组的同学发现
纸的长与宽分别为
和
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纸的长与宽的比是一个特殊值“
”,不妨定义长与宽的比为
的矩形为“标准矩形”
【操作实践】:如图
,数学活动小组的同学在几何画板软件上画了一个正方形
,连接对角线
,在射线
上截取了
,过点
作
交
的延长线于点
,令
.
【问题探究】:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/5e22910f-6a54-42c3-874e-64a5a101f6b2.png?resizew=402)
(1)求证:四边形
为“标准矩形”;
(2)如图
,数学活动小组的同学在图
的基础上隐藏了线段
,在线段
上取一点
,连接
,
.
①当
平分
时,求
的长;
②当
的周长最小时,求
的值
【问题情境】:通过查看出厂包装袋上的数据,数学活动小组的同学发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b553e2a281714677e29a5e97dd7d5a3.png)
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【操作实践】:如图
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【问题探究】:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/5e22910f-6a54-42c3-874e-64a5a101f6b2.png?resizew=402)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e9785a8ffb637c91757fe01d3c23a5.png)
(2)如图
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①当
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②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7f9f7952c4be18cb73393047c2ad75.png)
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【推荐1】如图,四边形DEFG是ΔABC的内接矩形,如果ΔABC的高线AH长8cm,底边BC长10cm,设DG=xcm,DE=ycm,求y关于x的函数关系式.
![](https://img.xkw.com/dksih/QBM/2017/4/17/1667544259903488/1670010526711808/STEM/d48f9969bddd4180bb614617c8db9879.png?resizew=127)
您最近一年使用:0次
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适中
(0.65)
【推荐2】【问题提出】如图①,在正方形
中,
、
分别是边
和对角线
上的点,
,从而
,
______.
中,
,
,
、
分别是边
和对角线
上的点,
,若
,求
的长.
【拓展延伸】如图③,在菱形
中,
,对角线
,
交
的延长线于点
,
、
分别是菱形高
和对角线
上的点,
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8f670b1ddb7bf00741f14965e127e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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【拓展延伸】如图③,在菱形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
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