综合与实践.
(1)问题1:如图①,以
为基础,借助无刻度直尺和圆规作一个平行四边形,标注字母,并说明理由;
(2)问题2:如图②,在平行四边形
中,对角线
,
相交于点O,取
的中点E,连接
并延长至点F,使得
,连接
,
,出现了新的特殊四边形,请判断其中一个四边形的形状,并说明理由;
(3)问题3:如图③,在问题2的平行四边形
中添加一个条件,使四边形
变成矩形,你添加的条件是 ,说明理由;
(4)问题4:如图④,在平行四边形
中,若
,过点O作直线
,如果
,
,试求出线段
的长度.(提示:利用勾股定理和菱形面积公式)
(1)问题1:如图①,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(2)问题2:如图②,在平行四边形
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/548c632acc0f0f2ae41f90ce24e23e59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)问题3:如图③,在问题2的平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1e902581960c17ad97a5e29e2c0c56.png)
(4)问题4:如图④,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66fae8e33cd86fa8dab72704eaafe1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/fa32bd55-f2b8-4d93-b768-a3744a7f4547.png?resizew=617)
21-22八年级下·山西晋城·期末 查看更多[2]
山西省晋城市阳城县2021-2022学年八年级下学期期末学业质量检测数学试题(已下线)专题训练二 (特殊)平行四边形解答题强化高分必刷精选题-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(人教版)
更新时间:2023-02-06 23:00:22
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相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】几何综合:已知:点
是
边
上一动点,作
,点
、点
分别是边
、
上的点,且满足
,
,连接
;设
(常数
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/55279b5a-3469-4ed1-80c1-179f13f02333.png?resizew=561)
(1)证明推断:若
.如图1,
①求证:
;
②推断:当
,
时,
;
(2)类比探究:若
.如图2,当
时,试写出线段
、
、
与常数
之间一个相等关系,并证明;
(3)拓展应用:若
.如图3,设
,
,当
,
时,求常数
的值和线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3322a2ad9a95bdc9fc576a7a158d4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/693753f40037127376e4746147d8e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f79744404aff0091e4e0682bd403d605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8984b9ed04f326cf5170ff200b53f135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248b0ba9c04357503d5f942dc0ff6082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e6228ef979d12858839a11477a0eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/55279b5a-3469-4ed1-80c1-179f13f02333.png?resizew=561)
(1)证明推断:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34225a360b34beb4887f4cd5b588620.png)
②推断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d959ad0bf10a92c6c6be067f7094fcb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb30f2050e85fa917ca34ab43ad2599.png)
(2)类比探究:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac57c755370b6cbf96fcd3314dabb99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f63f86bf960e27b80242bcff9abd618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c172aabec642737a6752961c93b522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)拓展应用:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7d3b817c1747921b630598ec433cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d08d15a1fc1bce496b40ecb7eab0e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
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【推荐2】在菱形
中,
.
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230341312512/2446471965900800/STEM/7bf32a83-5696-44bc-bab6-6615042ef6e8.png?resizew=429)
(1)如图1,点
为线段
的中点,连接
,
.若
,求线段
的长.
(2)如图2,
为线段
上一点(不与
,
重合),以
为边向上构造等边三角形△AMN,线段
与
交于点
,连接
,
,
为线段
的中点.连接
,
,判断
与
的数量关系,并证明你的结论.
(3)在(2)的条件下,若
,请你直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://img.xkw.com/dksih/QBM/2020/4/21/2446230341312512/2446471965900800/STEM/7bf32a83-5696-44bc-bab6-6615042ef6e8.png?resizew=429)
(1)如图1,点
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa0df3aec8659a3ee7b77560aad06ee.png)
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【推荐3】【问题】
在
中,
,
,点
在直线
上(
除外),分别经过点
和点
作
和
的垂线,两条垂线交于点
,研究
和
的数量关系.
【探究发现】
某数学兴趣小组在探究
,
的关系时,运用“从特殊到一般”的数学思想,他们发现当点
是
中点时,只需要取
边的中点
(如图1),通过推理证明就可以得到
和
的数量关系,请你按照这种思路直接写出
和
的数量关系;
【数学思考】
那么点
在直线
上(
除外)(其他条件不变),上面得到的结论是否仍然成立呢?
请你从“点
在线段
上”“点
在线段
的延长线上”“点
在线段
的反向延长线上”三种情况中,任选一种情况,在图2中画出图形,并证明你的结论.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【探究发现】
某数学兴趣小组在探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
【数学思考】
那么点
![](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/ab609a6574633ebabcff3e73fa862081.png)
请你从“点
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/6/3918ab3a-a428-4b04-8100-dadc224fc76d.png?resizew=242)
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【推荐1】如图,矩形
在平而直角坐标系中,点A在x轴的正半轴上,点C在y轴的正半轴上,点
,点
,E是
上一点,现将
沿直线
折叠,点A落在
边上的点D处.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/71337306-a686-4a8d-81d9-8fcd3c9d8888.png?resizew=696)
(1)如图1,求D的坐标;
(2)如图2,点P从原点O出发,以2个单位/秒的速度向终点C运动,设
的面积为S,运动时间为t秒,求S与t的关系式,并直接写出t的取值范围;
(3)如图3,在(2)的条件下,当
时,在线段
上取一点N,连接
、
,在第三象限内取一点M,连接
、
,
与y轴交于T,若
,
,
,求N点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81898d3419474e961d59cb5450f0e8b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/71337306-a686-4a8d-81d9-8fcd3c9d8888.png?resizew=696)
(1)如图1,求D的坐标;
(2)如图2,点P从原点O出发,以2个单位/秒的速度向终点C运动,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2955137763018ea99071a5eb1320c58.png)
(3)如图3,在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9d51a70b2525488342058cd94bea75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4a047714a74806403416ba8c0a2d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323d600e51c8513286ceccd682da0e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83805f70092ef1e68d2a8b6918d3340.png)
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【推荐2】阅读下列材料,并按要求解答.
【模型建立】如图①,等腰直角三角形ABC中,∠ACB=90°,CB=CA,直线ED经过点C,过A作AD⊥ED于点D,过B作BE⊥ED于点E.求证:△BEC≌△CDA.
【模型应用】
应用1:如图②,在四边形ABCD中,∠ADC=90°,AD=6,CD=8,BC=10,AB2=200.求线段BD的长.
应用2:如图 ③,在平面直角坐标系中,纸片△OPQ为等腰直角三角形,QO=QP,P(4,m),点Q始终在直线OP的上方.
![](https://img.xkw.com/dksih/QBM/2020/2/13/2405030946996224/2435820292317184/STEM/79de21729aea47f2bcfa9e73955e0516.png?resizew=510)
(1)折叠纸片,使得点P与点O重合,折痕所在的直线l过点Q且与线段OP交于点M,当m=2时,求Q点的坐标和直线l与x轴的交点坐标;
(2)若无论m取何值,点Q总在某条确定的直线上,请直接写出这条直线的解析式 .
【模型建立】如图①,等腰直角三角形ABC中,∠ACB=90°,CB=CA,直线ED经过点C,过A作AD⊥ED于点D,过B作BE⊥ED于点E.求证:△BEC≌△CDA.
【模型应用】
应用1:如图②,在四边形ABCD中,∠ADC=90°,AD=6,CD=8,BC=10,AB2=200.求线段BD的长.
应用2:如图 ③,在平面直角坐标系中,纸片△OPQ为等腰直角三角形,QO=QP,P(4,m),点Q始终在直线OP的上方.
![](https://img.xkw.com/dksih/QBM/2020/2/13/2405030946996224/2435820292317184/STEM/79de21729aea47f2bcfa9e73955e0516.png?resizew=510)
(1)折叠纸片,使得点P与点O重合,折痕所在的直线l过点Q且与线段OP交于点M,当m=2时,求Q点的坐标和直线l与x轴的交点坐标;
(2)若无论m取何值,点Q总在某条确定的直线上,请直接写出这条直线的解析式 .
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【推荐3】如图1,把一个含45°角的直角三角板ECF和一个正方形ABCD摆放在一起,使三角板的直角顶点和正方形的顶点C重合;点E、F分别在正方形的边CB、CD上,连接AF,取AF中点M,EF的中点N,连接MD、MN.
(2)在(1)的条件下,请判断线段MD与MN的关系,并加以证明.
(3)如图2,将图1中的直角三角板ECF绕点C顺时针旋转180°,其他条件不变,当
,
时,求MN的长.
(2)在(1)的条件下,请判断线段MD与MN的关系,并加以证明.
(3)如图2,将图1中的直角三角板ECF绕点C顺时针旋转180°,其他条件不变,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
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【推荐1】课本再现
中,D,E分别是边
,
的中点,在证明“三角形两边中点的连线与第三边的关系”时,小明通过延长
到点F,使
,连接
,
证明:四边形
是平行四边形.
类比迁移
(2)在四边形
中,E为
的中点,点G、F分别在
、
上,连接
、
、
,且
.
①如图2,若四边形
是正方形,
、
、
之间的数量关系为________;
②如图3,若四边形
是平行四边形,①中的结论是否成立,请说明理由.
方法运用
(3)如图4,在四边形
中,
,
,E为
的中点,G、F分别为
、
边上的点,若
,
,
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211c130e20ea36d96e88927f88df956e.png)
类比迁移
(2)在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79213fcec35165258910f4b71d5d3cac.png)
①如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
②如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
方法运用
(3)如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d5ce86dca42eb3f3a98f9efa0a8f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0ce914a50f5376766d5065e5f13d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d770d4d9b267220f3faa26bb893d9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eba8bf0c4a8e49b3fac25832a0b0005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
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【推荐2】在矩形ABCD中,AB=6,BC=8,点E为BC延长线上一点,且BD=BE,连接DE,Q为DE的中点,有一动点P从B点出发,沿BC以每秒1个单位的速度向E点运动,运动时间为t秒.
(1)如图1,连接DP、PQ,则S△DPQ=_____(用含t的式子表示);
(2)如图2,M、N分别为AB、AD的中点,当t为何值时,四边形MNQP为平行四边形?请说明理由;
(3)如图3,连接CQ,AQ,试判断AQ、CQ的位置关系并加以证明.
(1)如图1,连接DP、PQ,则S△DPQ=_____(用含t的式子表示);
(2)如图2,M、N分别为AB、AD的中点,当t为何值时,四边形MNQP为平行四边形?请说明理由;
(3)如图3,连接CQ,AQ,试判断AQ、CQ的位置关系并加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/1ed19db2-7710-4b6b-acd8-2a5684710822.png?resizew=504)
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【推荐1】【基础巩固】(1)如图1,在矩形
中,
,
,点E是
上的一点,连结
,若
,则
的值为______;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/23ccc3ab-5e09-4b17-a209-9996b06de679.png?resizew=172)
【类比探究】(2)如图2,在四边形
中,
,
,
,
,点E为
上一点,连结
,过点C作
的垂线交
的延长线于点G,交
的延长线于点F.求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/6b1fed61-a48b-4203-88a7-8ba9c238446a.png?resizew=180)
【拓展延伸】(3)如图3,在
中,
,
,
,将
沿
翻折得
,点E,F分别在边
上,连结
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fe1363ef62726e068550cf6b145596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/23ccc3ab-5e09-4b17-a209-9996b06de679.png?resizew=172)
【类比探究】(2)如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae8221601c7bd5c51fd520615581fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/6b1fed61-a48b-4203-88a7-8ba9c238446a.png?resizew=180)
【拓展延伸】(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16834582e86f9c1030a4a4b316fab909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137717f0e360e82319ced7e3a6c69b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21cc3c5593dee883a54618c948ca8807.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/29/daa87ca3-c682-4351-aea1-d3ea16f52ba6.png?resizew=199)
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【推荐2】同学们还记得吗?图①,图②是人教版八年级下册教材“实验与探究”中我们研究过的两个图形.受这两个图形的启发,数学兴趣小组提出了以下三个问题,请你回答:
的对角线相交于点O,点O又是正方形
的一个顶点,
交
于点
,
交
于点
,则
与
的数量关系为________;
【问题二】受图①启发,兴趣小组画出了图③:直线
、
经过正方形
的对称中心
,直线
分别与
、
交于点
、
,直线
分别与
、
交于点
、
,且
,若正方形
边长为8,求四边形
的面积;
【问题三】受图②启发,兴趣小组画出了图④:正方形
的顶点
在正方形
的边
上,顶点
在
的延长线上,且
,
.在直线
上是否存在点
,使
为直角三角形?若存在,求出
的长度;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4195334905e2f190f958dbf5951456f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec275f823ae17afdba53301fcbd2aa43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
【问题二】受图①启发,兴趣小组画出了图③:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c390dda36a4aaa17262a8ece8f2f9f27.png)
【问题三】受图②启发,兴趣小组画出了图④:正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceff3844281849df3e37a2e56e110549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐3】在平面直角坐标系xOy中,已知反比例函数
的图像与正比例函数
的图像交于点A、点C,与正比例函数
的图像交于点B、点D,设点A、D的横坐标分别为s,t(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/927123f2-0d51-404a-82ff-e6bd52320baa.png?resizew=532)
(1)如图1,若点A坐标为(2,4).
①求m,k的值;
②若点D的横坐标为4,连接AD,求△AOD的面积.
(2)如图2,依次连接AB,BC,CD,DA,若四边形ABCD为矩形,求mn的值.
(3)如图3,过点A作
轴交CD于点E,以AE为一边向右侧作矩形AEFG,若点D在边GF上,试判断点D是否为线段GF的中点?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e549fa6c67a603ac644fe1e91ccc3de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98621d43da3ef184af5e14748fb9325a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218695216264a3cb92189272e51e83b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/675fe0f67974031fda8833476c377f84.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/927123f2-0d51-404a-82ff-e6bd52320baa.png?resizew=532)
(1)如图1,若点A坐标为(2,4).
①求m,k的值;
②若点D的横坐标为4,连接AD,求△AOD的面积.
(2)如图2,依次连接AB,BC,CD,DA,若四边形ABCD为矩形,求mn的值.
(3)如图3,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8178c63d125ee6235feeb2fc70d02745.png)
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