如图,菱形ABCD的对角线AC与BD相交于O,E是BC中点,连接OE并延长到F,使EF=OE.
(1)求证:四边形OBFC是矩形.
(2)如果作BG∥OF,FG∥BC,四边形BGFE是何特殊四边形?并说明理由.
(1)求证:四边形OBFC是矩形.
(2)如果作BG∥OF,FG∥BC,四边形BGFE是何特殊四边形?并说明理由.
![](https://img.xkw.com/dksih/QBM/2020/10/15/2571272516108288/2571756697477120/STEM/ea93db7059bc441c969af9a2b69cb60d.png?resizew=196)
更新时间:2020-10-15 21:55:18
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【推荐1】如图,在▱ABCD中,点O是对角线AC的中点,点E在AD延长线上,连接EO,并延长交CB延长线于点F.求证:DE=BF.
![](https://img.xkw.com/dksih/QBM/2022/4/17/2960113980858368/3063568722051072/STEM/35cab13efabb4a9abb741187535c5dd1.png?resizew=119)
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【推荐2】如图,将平行四边形
的边
延长至点
,使
,连接
,
,
交
于点
.
(1)求证:
;
(2)连接
,若
,求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e92f48e9bfe12d145f7d2a2f0360d0.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/7449c8d9-046c-4c9a-b66b-056088042827.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ff95a85058f1803a7630c08c443df.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b7f35738524dcb80969b063f8966b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfe2a58326612fcabd34fd4402a66ee.png)
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【推荐1】如图,在△ABC中,点D,E分别是边BC,AC上的中点,连接DE,并延长DE至点F,使EF=ED,连接AD,AF,BF,CF,线段AD与BF相交于点O,过点D作DG⊥BF,垂足为点G.
(1)求证:四边形ABDF是平行四边形;
(2)当
时,试判断四边形ADCF的形状,并说明理由;
(3)若∠CBF=2∠ABF,求证:AF=2OG.
(1)求证:四边形ABDF是平行四边形;
(2)当
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(3)若∠CBF=2∠ABF,求证:AF=2OG.
![](https://img.xkw.com/dksih/QBM/2019/6/17/2227687229030400/2229188130660352/STEM/baae50d7-c0f6-46e1-9a4b-a13b8c83b8d5.png)
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【推荐2】如图,
中,
,
、
为
上两点,且
,过
、
分别作
交
于
,
交
于
,连接
.
为矩形;
(2)连接
、
,直接写出图中所有相等的线段(不包含题中已知相等的线段).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a34f25241d7f1ba6e60887378af803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e430f13f42cf2d44aa0f0e20b959684f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3768dceb544862d9d9abae3389ac7236.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03526fddc48f9f7298afc3da414c2e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
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【推荐1】已知二次函数
的图象与x轴相交于点A和点
,与y轴相交于点
,抛物线的对称轴是直线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/819d4d3f-0aeb-41d7-bfe2-12010bf8df15.png?resizew=146)
(1)求二次函数的表达式及A点的坐标;
(2)D是抛物线的顶点,点E在抛物线上,且与点C关于抛物线的对称轴对称,直线BE交对称轴于点F,试判断四边形CDEF的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/819d4d3f-0aeb-41d7-bfe2-12010bf8df15.png?resizew=146)
(1)求二次函数的表达式及A点的坐标;
(2)D是抛物线的顶点,点E在抛物线上,且与点C关于抛物线的对称轴对称,直线BE交对称轴于点F,试判断四边形CDEF的形状,并说明理由.
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解答题-证明题
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【推荐2】如图,在
中,过点A作
于点E,
于点F,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982040749449216/2982916682063872/STEM/da9f799b1ecd43e78f23990333135cf2.png?resizew=167)
(1)求证:
是菱形.
(2)若
,求平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
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![](https://img.xkw.com/dksih/QBM/2022/5/18/2982040749449216/2982916682063872/STEM/da9f799b1ecd43e78f23990333135cf2.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(2)若
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