如图,已知
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/4a5be497-9728-403d-a602-65bf5b639be9.png?resizew=228)
(1)求证:四边形ABCD是平行四边形;
(2)若
,
,求CE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/226c231c1150e27c34eb787a46b02ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78043e0d08a81f03af4e14625981048e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa6481beb14c81b1371fdcede025b5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/4a5be497-9728-403d-a602-65bf5b639be9.png?resizew=228)
(1)求证:四边形ABCD是平行四边形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f807fa55d6a411a31cd1c6bc8cffe59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
更新时间:2022-09-02 22:06:41
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,点
、
分别在
的两边上,点
是
内一点,
,
,
于点
,
于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/26/ea3b9b4f-afe8-4f1f-9912-096a3d781f7d.png?resizew=160)
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名校
【推荐2】已知如图,B是CE的中点,AD=BC,AB=DC.DE交AB于F点.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/0b195ea1-e75f-4246-9df1-6541c17401c2.png?resizew=196)
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
(2)AF=BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/28/0b195ea1-e75f-4246-9df1-6541c17401c2.png?resizew=196)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
(2)AF=BF.
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解答题-问答题
|
适中
(0.65)
【推荐1】问题背景:(1)如图1,
,
,
,图中存在一个三角形绕某点旋转得到另一个三角形,直接写出旋转中心和旋转角;
变式运用:(2)如图2,
为
外一点,
,
,
,试探究线段
,
,
之间的数量关系,说明理由;
拓展创新:(3)如图3,在菱形
中,
,
,
为
上的一动点,将线段
绕点
逆时针旋转
得到线段
,连接
,延长
交
于点
,连接
,若
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
变式运用:(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a94c698168d0ec18ea4d6c2aecf36d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
拓展创新:(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c118858379800688c993a8b61270b356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb738130d1a51b71c2f5d13f26d222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/c1869812-6902-490d-8423-21b3e0744d99.png?resizew=511)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
是
的直径,D、E为
上位于
异侧的两点,连接
并延长至点C,使得
,连接
交
于点F,连接
、
、
.
(1)证明:
;
(2)若
,求
的度数;
(3)设
交
于点G,若
,E是弧
的中点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b7513e09cccf40c3a483064b97e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/de7aebb8-a9d0-46a3-ae6d-98de07683c47.png?resizew=182)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2151388a129f019c64301dfbee190c3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17417384653d460f18c4c4a52a0a6354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384da7acfefa7c656eaca2df173f0cb6.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/278ee50887101dcdf06657e6d6bf808e.png)
您最近一年使用:0次
解答题-证明题
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(0.65)
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【推荐1】如图,在四边形
中,点E、F分别在
上,
与
相交于点O,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
求证:四边形
是平行四边形;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348bcd111b8e27d112581e4ef37e2349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e310f6d7c766e0f9cde73300a8af30bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/30/134b55c7-85cd-4e5f-92e9-24b5db757916.png?resizew=182)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系中,
,
,
,
,并且a、b满足
.一动点P从点A出发,在线段
上以每秒2个单位长度的速度向点B运动;动点Q从点O出发在线段
上以每秒1个单位长度的速度向点C运动,点
分别从点
同时出发,当点P运动到点B时,点Q随之停止运动.设运动时间为t(秒).
两点的坐标.
(2)当t为何值时,四边形
是平行四边形?并求出此时
两点的坐标.
(3)当t为何值时,
是以
为腰的等腰三角形?并求出
两点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e236c1bce14d0225438e4ef85102076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b658ee9d42d21692bfd7578626eac10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0915b8c9092785049b0cf1cb92eb64e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82948c56ef35919dedab9d81fbc654c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/796cba5341f48805d534b5818dc233b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d5249a8db3920bdde5fee61d5c287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e97f75fa98b61d856fd9efb384d64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0a942463f1626ac24741dee55cf1827.png)
(2)当t为何值时,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91243b2b02ca6bb260acf4064887771e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d5249a8db3920bdde5fee61d5c287.png)
(3)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51ece6bb53c3f5bf2da7d9ee5960e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898d5249a8db3920bdde5fee61d5c287.png)
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解答题-作图题
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适中
(0.65)
【推荐1】如图,在矩形ABCD中,
,请用尺规作图法,在BC边上求作一点E,使得
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b652c179df772e4a8e2a3db47d5684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1ab524ea51166c36ceebc70105e63a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/d8aebe9c-27c8-425d-a9b0-b5e445a6c302.png?resizew=166)
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解答题-证明题
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适中
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【推荐2】如图,矩形ABCD中,E是AD的中点,延长CE,BA交于点F,连接AC,DF.
![](https://img.xkw.com/dksih/QBM/2019/7/5/2240086233137152/2242986462789632/STEM/16940b3fd24a41808b5732a3875fd818.png?resizew=139)
(1)判断四边形ACDF的形状;
(2)当BC=2CD时,求证:CF平分∠BCD.
![](https://img.xkw.com/dksih/QBM/2019/7/5/2240086233137152/2242986462789632/STEM/16940b3fd24a41808b5732a3875fd818.png?resizew=139)
(1)判断四边形ACDF的形状;
(2)当BC=2CD时,求证:CF平分∠BCD.
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