题型:解答题
难度:0.65
引用次数:105
题号:17584327
如图,已知在四边形
中,
,点
是
的中点,连接
交
于点
,且点
是
的中点,求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c08557fb973646e064dd6e9ed669fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://img.xkw.com/dksih/QBM/2022/12/7/3125520267698176/3128007413440512/STEM/8d6533de8ef04163981ae55e4ab0aab2.png?resizew=172)
更新时间:2022-12-10 19:30:17
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解答题-问答题
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适中
(0.65)
【推荐1】如图,点D,E分别在AB,BC上,DE∥AC,AF∥BC,∠2=70°,求∠1的度数.
![](https://img.xkw.com/dksih/QBM/2020/5/15/2463276607389696/2463366923313152/STEM/ba77c51f916d4d6f9749a39ff76cd530.png?resizew=131)
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解答题-作图题
|
适中
(0.65)
【推荐2】在矩形ABCD中,BC>AB,将△ABC沿着AC翻折得到
AEC,点B的对称点为点E.
(1)试利用无刻度的直尺和圆规作图,求作:
AEC(保留作图痕迹,不写作法和证明过程);
(2)设EC交AD于点T,分别延长AE,CD相交于点Q,连接TQ,请补全图形,并证明:直线QT垂直平分AC.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)试利用无刻度的直尺和圆规作图,求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)设EC交AD于点T,分别延长AE,CD相交于点Q,连接TQ,请补全图形,并证明:直线QT垂直平分AC.
![](https://img.xkw.com/dksih/QBM/2021/7/19/2767345473880064/2832545198120960/STEM/66b5fac65e9f4b5097058fa14330c3f8.png?resizew=134)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,四边形
为矩形,
为矩形的一条对角线.
的左侧作
,射线
与
的延长线交于点E.连接
与
交于点F;(保留作图痕迹,不写做法,不下结论)
(2)小亮判断点F为线段
的中点.他的证明思路是:利用矩形的性质,先证明
为等腰三角形,从而得到点B为
的中点,再利用三角形全等,得到点F为
的中点.请根据小亮的思路完成下面的填空:
证明:∵四边形
为矩形
∴
,
,
,
∵
,
∴①___________,
∵
,
∴
,
∵
,
∴
,
∴
,
,
∴②___________,
∴
,
∵
,
∴
,
∴③___________,
∵
,
∴
,
∵
,
,
∴④___________
,
∴
,
∴点F为
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbe2868eae66eeb11bff8864388d0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)小亮判断点F为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
证明:∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405effb49ef901476701e72cc47918da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
∴①___________,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbe2868eae66eeb11bff8864388d0f2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233369aa9727d0bdbfe274459c9ae4c6.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b405a122ded2eb0395d5434892ae7b45.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/613b4e0df12a931bb7b11934a46ae878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d669b8b6e335d528e251770ecc9c5.png)
∴②___________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
∴③___________,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035bafd75e4f2dd8b05f8b37b9f20222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f31b993a322a95f47f3728746b9b261.png)
∴④___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00789287044283e960c443cac80a56f7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458f98e7078cb3259c18542be9749feb.png)
∴点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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解答题-证明题
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名校
【推荐2】如图,点
,
,
,
在一条直线上,
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaae99b4ac308549134169e69247a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://img.xkw.com/dksih/QBM/2022/1/10/2897829289181184/2927512554348544/STEM/b413a772-a353-4c25-ad50-c65159edecce.png?resizew=194)
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解答题-证明题
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适中
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【推荐1】如图,
和
是两个边长都为
的等边三角形,且B,D,C,E都在同一直线上,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/0cfac427-afd0-43a2-9d6f-dc66849378b6.png?resizew=134)
(1)求证:四边形
是平行四边形;
(2)若
,
沿着
的方向以每秒
的速度运动,设
运动时间为t秒.当t为何值时,平行四边形
是菱形?请说明你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/0cfac427-afd0-43a2-9d6f-dc66849378b6.png?resizew=134)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937b9e610b548398bc46ed29951e7f74.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73721d69c3c3dece2996af8bd6a0052f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937b9e610b548398bc46ed29951e7f74.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图1,在正方形
中,点
是
边上的一点,
,且
交正方形外角的平分线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/c6a71343-8be8-43d2-a223-e387319e8d44.png?resizew=295)
(1)求证:
;
(2)求证:
;
(3)在
边上是否存在点
,使得四边形
是平行四边形?若存在,请画出图形并给予证明;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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca058cab8f82c49da54760c7af98c800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/c6a71343-8be8-43d2-a223-e387319e8d44.png?resizew=295)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a1b95f8e4ecd4c9e42ac99e4dcf070.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd72a32b01cde3803f106f00a83458c.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836ddb40ef039d63a043bed22046e1c.png)
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