【问题情境】:
(1)如图1,四边形
是正方形,点
是
边上的一个动点,以
为边在
的右侧作正方形
,连接
,则
与
的数量关系是______.
【类比探究】:
(2)如图2,四边形
是矩形,
,
,点
是
边上的一个动点,以
为边在
的右侧作矩形
,且
,连接
、
.判断线段
与
有怎样的数量关系,并说明理由:
【拓展提升】:
(3)如图3,在(2)的条件下,连接
,求
的最小值.
(1)如图1,四边形
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcae34454fa43998436a8915394de0e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【类比探究】:
(2)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13458f8259fd95e92dad787e91571a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
【拓展提升】:
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adabb437c815f64297bf0bbd184f9027.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/73d0ae28-6fcb-45a3-bbd0-94df7fa5f6d2.png?resizew=513)
更新时间:2023-12-28 11:25:33
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图
,在四边形
中,
,
,
平分
,点
是
上一点,连接
并延长分别交
和
的延长线于点
和点
.
(1)证明:四边形
是菱形;
(2)连接
,证明:
;
(3)如图
,连接
,若
,且
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/b212f642-296f-4f5f-ac48-3f430540fa01.png?resizew=488)
(1)证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe5ef1a4aef65388572588ac38c1894.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff7ba0385cda327f43ad12eba24ef30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3fa59bbd016ba85cd38499697434c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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名校
【推荐2】问题解决:
(1)已知在
中,
,
.四边形
是正方形.H为
所在的直线与
的交点,如图1,当点F在
上时,请判断
和
的关系,并说明理由.
(2)如图2将正方形
绕点C旋转,当点D在直线
右侧时连接
,请就图2证明:
;
(3)将正方形
绕点C旋转一周,当
时,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd344f55d78f4afa49c15e43c189db9.png)
.请直接写出线段
的长.
(1)已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03cc9c1600db3a5653e5903db8286e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/a001dabb-76ba-4bfd-9436-ad1f575d8bda.png?resizew=520)
(2)如图2将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95062620b1918f675e211914f1232355.png)
(3)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efd344f55d78f4afa49c15e43c189db9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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【推荐3】阅读理解:
(1)【学习心得】
学习完“圆”这一章内容后,有一些几何问题,如果添加辅助圆,可以使问题变得容易.我们把这个过程称为“化隐圆为显圆”.这类题目主要是两种类型.
①类型一,“定点+定长”:如图1,在
中,
,
,D是
外一点,且
,求
的度数.
解:若以点A(定点)为圆心,
(定长)为半径作辅助圆
,(请你在图1上画圆)则点C、D必在
上,
是
的圆心角,而
是圆周角,从而可容易得到
°.
②类型二,“定角+定弦”:如图,
中,
,
,P是
内部的一个动点,且满足
,求线段
长的最小值.
解:∵
,
∴
,∵
,∴
,
∴
,(定角)
∴点P在以
(定弦)为直径的
上,请完成后面的过程.
(2)【问题解决】
如图3,在矩形
中,已知
,点P是
边上一动点(点P不与B,C重合),连接
,作点B关于直线
的对称点M,则线段
的最小值为 .
(3)【问题拓展】
如图4,在正方形
中,
,动点E,F分别在边
,
上移动,且满足
.连接
和
,交于点P.
①请你写出
与
的数量关系和位置关系,并说明理由;
②点E从点D开始运动到点C时,点P也随之运动,请求出点P的运动路径长.
(1)【学习心得】
学习完“圆”这一章内容后,有一些几何问题,如果添加辅助圆,可以使问题变得容易.我们把这个过程称为“化隐圆为显圆”.这类题目主要是两种类型.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/55ad0e1c-3759-48bf-9ace-bdfdb58d26ad.png?resizew=533)
①类型一,“定点+定长”:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb1ea72b925b12d1aa05826ad34c960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
解:若以点A(定点)为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
②类型二,“定角+定弦”:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/183502679f48214844957947db62ec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab546e81ccaef75153d97e65b1ce978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b0832dd92d51b237e59a67e31bf3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab546e81ccaef75153d97e65b1ce978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ad5162de10a31d3c9e6b8e9e7e964e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a84b7de4bcbaa36f542b7ac3886bba.png)
∴点P在以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)【问题解决】
如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1844834ef0315a704d8e2fba77544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
(3)【问题拓展】
如图4,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
①请你写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
②点E从点D开始运动到点C时,点P也随之运动,请求出点P的运动路径长.
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解题方法
【推荐1】如图,在矩形
中,
,
的平分线交
于点
,
于点
,连接
并延长交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/a799b602-5500-4cac-9257-463e27e696c8.png?resizew=162)
(1)求证:
;
(2)
与
相等吗?请说明理由,并求当
时矩形的面积;
(3)判断
、
、
三者的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1d36437d9e50f560536853ecd636d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/344067523ee04f5cc546978ca0116e07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/a799b602-5500-4cac-9257-463e27e696c8.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e88cef673e7cf2ef692e3099657e06.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
(3)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
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【推荐2】如图,在矩形
中,
,
,菱形
的三个顶点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
,
分别在矩形
的边
,
,
上,
,连接
.
(1)如图1,当
时,求证:四边形
是正方形;
(2)如图2,当
的面积为
时,求菱形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/411b38a18046fea8e9fab1f9f9b80a5f.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cfeb35addf27f2379a8e5f87c9b952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/13200077-7e9e-4587-a9c4-cd75c37c83ec.jpg?resizew=339)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95b20cd1a43264e4533d4980c99fdad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8305e23d5378f1cbf5518256a37c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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解答题-作图题
|
较难
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名校
【推荐1】已知如图1,正方形ABCD,△CEF为等腰直角三角形,其中∠CFE=90°,CF=EF,连接CE,AE,AC,点G是AE的中点,连接FG
(1)用等式表示线段BF与FG的数量关系是 .
(2)若将△CEF绕顶点C旋转,使得点F恰好在线段AC上,并且点E在线段AC的上方,点G仍是AE的中点,连接FG,DF
①在图2中依据题意补全图形;
②求证:DF=
FG.
(1)用等式表示线段BF与FG的数量关系是 .
(2)若将△CEF绕顶点C旋转,使得点F恰好在线段AC上,并且点E在线段AC的上方,点G仍是AE的中点,连接FG,DF
①在图2中依据题意补全图形;
②求证:DF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2019/9/16/2291888243425280/2292237681819648/STEM/edf18c42afd546f4ae866b59907ed1c2.png?resizew=340)
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【推荐2】如图1,在边长为1的正方形
中,
平分
,交
于点E,过点E作
于点F,延长
交
的延长线于点H,过点F作
交
于点G,连接
.
;
(2)求证:四边形
是菱形;
(3)如图2,点M是
的中点,点P是
上的动点,点N是对角线
上的动点,请问
是否有最小值?如果有,求出最小值;如果没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a32ff42fed45ae870a688fb7103fa72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1048799a8cc0c8865b24a00a3173d6a.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
(3)如图2,点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
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解答题-证明题
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【推荐1】在菱形ABCD中,E,F分别为BC,CD上点,且CE=CF,连结AE,AF,EF.记△CEF的面积为m,△AEF的面积为n.
(1)求证:△ABE≌△ADF.
(2)若AE⊥BC,CF:AE=2:3,求sinD.
(3)设BE:EC=a,m=3﹣a,试说明当a取何值时n的值最大,并求出n的最大值.
(1)求证:△ABE≌△ADF.
(2)若AE⊥BC,CF:AE=2:3,求sinD.
(3)设BE:EC=a,m=3﹣a,试说明当a取何值时n的值最大,并求出n的最大值.
![](https://img.xkw.com/dksih/QBM/2019/5/15/2204034237259776/2209372121382912/STEM/d98dbd5dd29b461799e823d6f86d2f46.png?resizew=169)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,在平面直角坐标系中,二次函数
的图象与x轴交于点A和点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/63461e1e-d6a7-49e6-947b-2184942f543b.png?resizew=398)
(1)求二次函数的表达式;
(2)连接
,找出图中与
相等的角,并说明理由;
(3)若点P是抛物线上一点,满足
,求点P的坐标;
(4)若点Q在第四象限内,且
,
,线段
是否存在最大值,如果存在,求出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58a0b2c6080621bac5724762e3cb2c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ac227415188548180ea445fc383647.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/63461e1e-d6a7-49e6-947b-2184942f543b.png?resizew=398)
(1)求二次函数的表达式;
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fc1df99f9a3c9e22d2041a89e2880f.png)
(3)若点P是抛物线上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9177357c4268d8d0600825bf54c5edc2.png)
(4)若点Q在第四象限内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd70e4a3ca00411f4f4cad46f95698b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd8e64357ad1eff6337e6f0d42bbea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
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