如图,在平行四边形
中,点E,F分别为AB,AD边上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/81c14f30-6fd4-49c7-95b1-96972d424f86.png?resizew=488)
(1)如图1,若
,
,F为AD的中点,
;
①求证:CF平分
.
②若
,求EF的长;
(2)如图2,若P是CE延长线上的点,
,PC与BF交于点G.点G是PC的中点,且
,求线段BG、DF、BC之间存在的数量关系;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/81c14f30-6fd4-49c7-95b1-96972d424f86.png?resizew=488)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f46f19939f38833f9152942f8241b7c.png)
①求证:CF平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
(2)如图2,若P是CE延长线上的点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cab8679f216fecbef8bd5ad3ddcd0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a190ca248355200ba9a176ab577978ec.png)
更新时间:2022-06-27 06:33:42
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相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系中,四边形
是长方形,O为坐标原点,顶点A,C分别在y轴、x轴上,顶点B在第二象限内,一次函数
的图象分别与坐标轴交于点A,C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/f17e81d2-7671-4574-917c-529348c00355.png?resizew=533)
(1)如图①,将
折叠使得点C落在长方形的边
上的点E处,折痕为
,求点B,E的坐标;
(2)如图②,将
折叠使得点B落在对角线
上的点E处,折痕为
,求点D的坐标;
(3)在平面直角坐标系内,是否存在一点E(除点B外),使得
与
全等?若存在,写出所有符合条件的点E的纵坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8648fb5353d892f0504ca5302a19d132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/f17e81d2-7671-4574-917c-529348c00355.png?resizew=533)
(1)如图①,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)在平面直角坐标系内,是否存在一点E(除点B外),使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9930b716e6ff6181025875bfe27c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
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【推荐2】如图1,有等边
和等边
,将
绕点
顺时针旋转,得到图2所示的图形.
(1)求证:
;
(2)如图3,若
,
,且旋转角为
时,求
的度数;
(3)如图4,连接
,并延长
交
于点
,若
旋转至某一位置时,恰有
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/255cccdf-66d9-4cad-995d-eec3ca672e09.png?resizew=503)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d2bbdd30443a7b73738d051d9a5dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e219b4b74587a077f223fec499bace9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(3)如图4,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef3222a962b0a3b9bb1f4574b41bd79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f692d0437e200690eabcd84ebcfa8a9.png)
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名校
【推荐1】在△ABC中,AB=15,AC=13,BC边上高AD=12,试求△ABC周长.
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解题方法
【推荐2】如图,在梯形
中,
,
.
,
,
,动点P从点D出发,沿射线
的方向以每秒2个单位长的速度运动,动点Q从点C出发,在线段
上以每秒1个单位长的速度向点B运动,点P、Q分别从点D、C同时出发,当点Q运动到点B时,点P随之停止运动,运动时间为t(秒)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591346921472/2465921290059776/STEM/44a0022eb7d649dca1c3ee6247417343.png?resizew=218)
(1)设
的面积为S,求S与t之间的函数关系式;
(2)若四边形
为平行四边形,求运动时间t;
(3)当t为何值时,以B、P、Q三点为顶点的三角形是等腰三角形?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5acb763021bf166ca719d07223591d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b8a4b0e72a4de1da975168b243a325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29400d84b83222d78dc2204777c737fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975645d6a73a7326974511ca80b37f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2020/5/18/2465591346921472/2465921290059776/STEM/44a0022eb7d649dca1c3ee6247417343.png?resizew=218)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe83f1ae7e5f05d8bed6bf6f42db0e7d.png)
(3)当t为何值时,以B、P、Q三点为顶点的三角形是等腰三角形?
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【推荐1】如图,将
绕点A逆时针旋转到
的位置,使点
落在
上,
与
交于点E,若
.
(1)求
的长;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5428a5fb6f4b14e5d6d382fcb5067449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c43a1f82a3e65cde2aa99b1478229c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/4/ce73024f-afad-472e-a4d5-930c995a7572.jpg?resizew=151)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b25f3ea33cc08b1e2a0d9c3a9dccaf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】已知直线
(
,
为常数,
)分别与
轴,
轴交于点
,点
.
(1)求该直线的解析式;
(2)若点
是
轴上一点,且
的面积
.
①求点
的坐标;
②当点
在
轴的负半轴上时,是否存在点
,使以
,
,
,
为顶点的四边形是平行四边形?若存在,求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1a682ceca64f8b53216746fb76f3e07.png)
(1)求该直线的解析式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a779d6f5d17251bbb3e0d68609efd71d.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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名校
【推荐1】已知等腰直角
中,
,
,点
分别在边
、边
上,连接
,以
为直角顶点在
右侧作等腰直角
中,连接
.
(1)如图1,点
与点
重合时,猜想
和
的关系,并说明理由;
(2)如图2,
时,点
分别为
和
的中点,
①探究
和
三条线段之间的数量关系并证明;
②若
,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/18/2a59f776-45d6-4ff5-95e6-52c122be3804.png?resizew=294)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/735056c174e8dd7906257a2a50a962a7.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175c22bde07a8785b7441d535d595986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】【教材呈现】如图是华师版九年级上册数学教材第77页的部分内容.
【定理证明】(1)请根据教材内容,结合图①,写出证明过程.
【定理应用】(2)如图②,四边形
中,
分别为
的中点,边
延长线交于点
,
,则
______.
(3)如图③,在
中,
,
,
分别为
上一点,
分别为
的中点.当
时,
______.
猜想:如图,在![]() ![]() ![]() ![]() ![]() ![]() |
【定理应用】(2)如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60c6db49930fbbab66b1fab54f5449e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be141b63fe467a6d8c5b2df094ddfaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6764119d75e6ef5af6b7581ac4de7ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88c86113b4e517405d0155b94e1cedd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede1745e549ad66e2c9c4968cbc72e15.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b32c0db41b24ea2c1f7a354d839f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354a57a4fda4f140dd869138539fa652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a6824cd221701c7fe3f8cb4db5d6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d241ea190bd0cf03f198cae5b8c18287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b3247afa684b10c8e1da99cf33d5b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/d4956c9b-403e-4a01-bdb1-e317a3499b5a.png?resizew=371)
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