题型:解答题-问答题
难度:0.65
引用次数:50
题号:22680335
问题背景:如图1,在正方形
中,边长为4.点
,
是边
,
上两点,且
,连接
,
,
与
相交于点
.
与
的数量关系和位置关系,并证明;
(2)拓展提高:如图2,延长
至
,连接
,若
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea89499adc4ede5c30145f903d29699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(2)拓展提高:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5942a81561bf6617281126e97e5595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
更新时间:2024-05-10 13:02:21
|
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解答题-证明题
|
适中
(0.65)
【推荐1】如图1,已知点
,点
,且
满足
.
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893655542071296/2950783494692864/STEM/9404834d-7633-4b08-923b-33e82b8aa480.png?resizew=322)
(1)求
两点的坐标;
(2)若点C是第一象限内一点,且
,过点A作
于点F,求证:
;
(3)如图2,若点D的坐标为
,过点A作
,且
,连接
交x轴于点G,求G点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3160fc73f2a90ae4a1a97351ab2673b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9199b50dd0036be9b764c621d1d46f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663a61ad241d5d874c9a9362f0ee917c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c814617b66eb971dedea83ac03a8d7e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/13/2893655542071296/2950783494692864/STEM/9404834d-7633-4b08-923b-33e82b8aa480.png?resizew=322)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(2)若点C是第一象限内一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208d67fb019c8b336234244c3104987c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b9a2f5c9877086517ac6d0cd9e30af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6b27bd5f1437c638082a7eec033b4c.png)
(3)如图2,若点D的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b1472e121da0ae5550329cfda5f0a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-问答题
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适中
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【推荐2】如图,△ABC和△ADE都是等腰直角三角形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/ac83e082-e606-4b75-a80e-a6ebdfb02656.png?resizew=357)
(1)如图1,点D、E都在△ABC外部,连接BD和CE相交于点F.①判断BD与CE的位置关系和数量关系,并说明理由;②若AB=2,
,求
的值.
(2)如图2,当点D在△ABC内部,点E在△ABC外部时,连接BE、CD,当AB=3,
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937996893f20b1edc43750ee24c31b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/ac83e082-e606-4b75-a80e-a6ebdfb02656.png?resizew=357)
(1)如图1,点D、E都在△ABC外部,连接BD和CE相交于点F.①判断BD与CE的位置关系和数量关系,并说明理由;②若AB=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0022b969fadff20faead07c20362c4bf.png)
(2)如图2,当点D在△ABC内部,点E在△ABC外部时,连接BE、CD,当AB=3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d3549a9ca314289e64ea8c601e34fb.png)
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解答题-问答题
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【推荐1】如图所示的红丝带是全世界关心艾滋病患者行动的标志,它将宽
的红丝带交叉成
角重叠在一起.求重叠部分四边形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a3d448d4e52782ca2024411c5a11fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e5b86599355b1bb1cf5f9425089655.png)
![](https://img.xkw.com/dksih/QBM/2022/11/28/3119321295626240/3119556657143808/STEM/f6d785c74ed340189c3398472f26aeba.png?resizew=119)
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名校
【推荐2】一些不便于直接测量的圆形孔道的直径可以用如下方法测量.如图,把一个直径为10mm的小钢球紧贴在孔道边缘,测得钢球顶端离孔道外端的距离为8mm.求这个孔道的直径AB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/d5d10f80-1d42-4466-a98d-d06495360d77.png?resizew=189)
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解答题-问答题
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【推荐3】综合与实践:折纸是一项有趣的活动,折纸活动也伴随着我们初中数学的学习.在折纸过程中,我们可以研究图形的运动和性质,也可以在思考问题的过程中,初步建立几何直观,现在就让我们带着数学的眼光来折纸吧.
定义:将纸片折叠,若折叠后的图形恰能拼成一个无缝隙、无重叠的矩形,这样的矩形称为完美矩形.
如图①,将
纸片按所示折叠成完美矩形
,若
的面积为24,
,则此完美矩形的边长
,面积为 .
(2)类比探究:
如图②,将平行四边形
纸片按所示折叠成完美矩形
,若平行四边形
的面积为
,
,则完美矩形
的周长为 .
(3)拓展延伸:
如图③,将平行四边形
纸片按所示折叠成完美矩形
,若
,
,求此完美矩形的周长为多少.
定义:将纸片折叠,若折叠后的图形恰能拼成一个无缝隙、无重叠的矩形,这样的矩形称为完美矩形.
如图①,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96cf3f9a01a810792ebacc7f5bc70e97.png)
(2)类比探究:
如图②,将平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
(3)拓展延伸:
如图③,将平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cb735aa4e49868af6b6113bf12fc2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cbab64c34b6317ee4c68ba7f8d56c7.png)
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解答题-作图题
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适中
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【推荐1】 图①、图②、图③均是
的正方形网格,每个小正方形的顶点称为格点.点A、B、C、D均在格点上,只用无刻度的直尺,分别在给定的网格中按下列要求画图,保留作图痕迹.
的对称点N;
(2)在图②中,点E、F在格点上,在线段
上确定一点O,连结
、
,使
;
(3)在图③中,点P在
上且不是格点,在线段
上确定一点O,使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e329a94337ada7c88a4fad9b92f0eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)在图②中,点E、F在格点上,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a058cae0180d83f8683beb99a500ac8.png)
(3)在图③中,点P在
![](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/b322575bd5015b95b9183f4eb97abbc1.png)
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解答题-问答题
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【推荐2】已知四边形ABCD是正方形,点E为正方形ABCD内一点,连结EB、FA,把△BAE逆时针旋转得到了△DAF.
(1)如图①,旋转中心是 ,旋转角是 度.
(2)如图①,连结EF,请判断△AEF的形状,并说明理由.
(3)如图①,BE与DF有什么数量关系和位置关系?并说明理由.
(4)如图②,若点B、E、F恰好在一条直线上,请直接写出∠AFD的度数及FB、FE、FD的数量关系.
(1)如图①,旋转中心是 ,旋转角是 度.
(2)如图①,连结EF,请判断△AEF的形状,并说明理由.
(3)如图①,BE与DF有什么数量关系和位置关系?并说明理由.
(4)如图②,若点B、E、F恰好在一条直线上,请直接写出∠AFD的度数及FB、FE、FD的数量关系.
![](https://img.xkw.com/dksih/QBM/2019/6/28/2235398661677056/2235919773827072/STEM/d263e6e8dc264b6abd56525346a9540c.png?resizew=279)
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