如图,由
个形状、大小完全相同的小矩形组成一个大的矩形网格,小矩形的顶点称为这个矩形网格的格点,已知这个大矩形网格的宽为
,
的顶点都在格点.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdbb06b06e98b0b0b7528b144d41875.png)
更新时间:2024-05-20 21:59:57
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】图1是一个长为
,宽为
的长方形,沿图中虚线用剪刀平均裁成四块小长方形,然后按如图2所示的形状拼成一个大正方形.
(1)图2中的阴影部分正方形的边长是 (用含a,b的代数式表示);
(2)观察图1,图2,能验证的等式是: (请选择正确的一个);
A.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f88bd30cd20a8b2b2f8d3019674f0af.png)
B.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e516164bc710da837f57e7d2b5a0b8e.png)
C.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e67b2f8f971a87b883472dcce0dd43b.png)
(3)如图3,C是线段
上的一点,以
为边向上分别作正方形
和正方形
,连接
.若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fe570ddd875c9158a41091a84b485b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd0a92167d89b285ed12193ade0a3c1c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/24/7cc2175d-d057-458c-ad62-64e59b4e80f2.png?resizew=406)
(1)图2中的阴影部分正方形的边长是 (用含a,b的代数式表示);
(2)观察图1,图2,能验证的等式是: (请选择正确的一个);
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f88bd30cd20a8b2b2f8d3019674f0af.png)
B.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e516164bc710da837f57e7d2b5a0b8e.png)
C.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e67b2f8f971a87b883472dcce0dd43b.png)
(3)如图3,C是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b60c3b75ff1610956dfe9a9cd7692d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b2a9d2ed667f290de283e41b8a4fa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
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解答题-问答题
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(0.65)
名校
【推荐2】为了体验成长,收获快乐,学校计划组织初一同学开展以“寻根.行走青春”为主题的研学活动.训练时,将全年级的同学分成了三个人数相同,排列方式也完全相同的队伍进行训练,当三支队伍正好按如图所示的方式站立时,(图中阴影部分既为三支队伍),发现从正前方看有
人,从侧面看有
人.
(1)求本次研学初一年级共有多少人参加?
(2)基地计划一共租
、
两种型号的客车20辆,若一辆
型车可载30人,租金为320元,一辆
型车可载45人,租金为400元.在保证将全部师生送达目的地的前提下租车费用不超过7200元,学校可以选择几种租车方案?最少租车费用是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bbca919dbf6886562d6d28cd57f576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8986c2dee094ffb5cae517312d314717.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/187bd97e-0ae4-4d16-96be-da17c19cb147.png?resizew=159)
(1)求本次研学初一年级共有多少人参加?
(2)基地计划一共租
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解答题-证明题
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适中
(0.65)
【推荐1】已知
和
都是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/08df09fd-f1fb-4e0e-aa3b-2d176c7b02ce.png?resizew=435)
(1)如图1,求证:
;
(2)如图2,当点D在
的延长线上时,求证:
;
(3)如图3,当点D在射线
上时,过点E作
于点F.猜想线段
、
与
之间存在的数量关系,并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/08df09fd-f1fb-4e0e-aa3b-2d176c7b02ce.png?resizew=435)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
(2)如图2,当点D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a918e4ddd2f74590e4d69db7721386.png)
(3)如图3,当点D在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-证明题
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【推荐2】如图,在Rt△ABC中,点E在AB上,把△ABC沿CE折叠后,点B恰好与斜边AC的中点D重合.
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361796680712192/2362218074562560/STEM/87295e7f949f46d8be989459dd7f0173.png?resizew=221)
(1)求证:△ACE为等腰三角形;
(2)若AB=6,求AE的长.
![](https://img.xkw.com/dksih/QBM/2019/12/24/2361796680712192/2362218074562560/STEM/87295e7f949f46d8be989459dd7f0173.png?resizew=221)
(1)求证:△ACE为等腰三角形;
(2)若AB=6,求AE的长.
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【推荐1】如图,△ABC是一块锐角三角形的余料,它的边BC=120mm,高AD=80mm.要把它加工成一个矩形零件PQMN,使矩形的一边在BC上,其余两个顶点分别在AB,AC上.问要使加工成的这个矩形面积最大,那么边长MN应是多少mm?
![](https://img.xkw.com/dksih/QBM/2017/4/12/1664137975201792/1667121474363392/STEM/59cc0b3c22f4480386f8870e3c50eb69.png?resizew=247)
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解答题-作图题
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名校
【推荐2】如图,矩形
中,
,
,
是
边上的一点,点
在
边上,且满足
.
(不要求写作法,但保留作图痕迹);
(2)若
,试确定
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b82fa8f506f8099ca06c36c706db479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ca287dbbeb12d1930f975db3b3f73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361b1be6d6e2e4d6a18e8e9b03329415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062484705cd199ad726701edc49501a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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解答题-证明题
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【推荐1】如图,在⊙O上有位于直径AB的两侧的定点C和动点P,
=2,点P在半圆弧AB上运动(不与A、B两点重合),过点C作直线PB的垂AC线CD,垂足为点D.
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951428718551040/2952857199747072/STEM/11f9da10-587b-4160-9319-163159b0bcad.png?resizew=417)
(1)如图1,求证:△ABC∽△PCD;
(2)类比(1)中的情况,当点P运动到什么位置时,△ABC≌△PCD?请在图2中画出△PCD,并说明理由.
(3)如图3,当点P运动到某一位置时,有CP⊥AB时,求∠BCD的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79586df2029edb34c7cb2f67dc3722.png)
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951428718551040/2952857199747072/STEM/11f9da10-587b-4160-9319-163159b0bcad.png?resizew=417)
(1)如图1,求证:△ABC∽△PCD;
(2)类比(1)中的情况,当点P运动到什么位置时,△ABC≌△PCD?请在图2中画出△PCD,并说明理由.
(3)如图3,当点P运动到某一位置时,有CP⊥AB时,求∠BCD的度数.
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解答题-问答题
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解题方法
【推荐2】如图,在平面直角坐标系中,
为原点,四边形
是矩形,点
、
的坐标分别是
和
,点
为对角线
上一动点(不与
、
重合),连结
,作
,交
轴于点
,以线段
、
为邻边作矩形
.
![](https://img.xkw.com/dksih/QBM/2019/7/8/2242457769025536/2242895059156992/STEM/dbfdeee734e84b85b73e0972788f39ff.png?resizew=181)
(1)填空:点
的坐标为______;
(2)当
是等腰三角形时,试求出
的长;
(3)设
,矩形
的面积为
,求
关于
的函数关系式,并求出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.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/25fe53f23c212e97b0d9a27837df0967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aed020709e268940a9a81840ca38beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acc4078a620e18f5bdd8621d5c9952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://img.xkw.com/dksih/QBM/2019/7/8/2242457769025536/2242895059156992/STEM/dbfdeee734e84b85b73e0972788f39ff.png?resizew=181)
(1)填空:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504388564cf808feff52c16bae297a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2633a6f46b0847158eebb05c743561aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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