如如图,在▱ABCD中,对角线AC与BD相交于点O,E,F,G,H分别是AO,BO,CO,DO上的点.
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833507876601856/2841800494088192/STEM/11a2f32256864449a69aa36d5c04ea83.png?resizew=167)
(1)如果AE=
AO,BF=
BO,CG=
CO,DH=
DO,那么四边形EFGH是平行四边形吗?证明你的结论;
(2)如果AE=
AO,BF=
BO,CG=
CO,DH=
DO,那么四边形EFGH是平行四边形吗?证明你的结论;
(3)如果AE=
AO,BF=
BO,CG=
CO,DH=
DO,其中n为大于1的正整数,那么上述结论还成立吗?
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833507876601856/2841800494088192/STEM/11a2f32256864449a69aa36d5c04ea83.png?resizew=167)
(1)如果AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
(2)如果AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
(3)如果AE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f8d8c1aaae98dc4dad2951273e95cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f8d8c1aaae98dc4dad2951273e95cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f8d8c1aaae98dc4dad2951273e95cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f8d8c1aaae98dc4dad2951273e95cb.png)
20-21八年级下·全国·课后作业 查看更多[1]
(已下线)【北师大版课时练习】 八年级下册 第六章 平行四边形 2 平行四边形的判定
更新时间:2021-11-01 10:40:49
|
【知识点】 利用平行四边形性质和判定证明解读
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】如图,
的对角线
,
相交于点O,分别延长
,
,
,
至点A,B,C,D,使点E,F,G,H分别是
,
,
,
的中点.
求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4183d9cb0e9fcba8bbe0bef6d51e1399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/21/c1ba61f8-730f-4fdb-9916-0f7ce9d8a4ed.png?resizew=175)
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解答题-证明题
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(0.85)
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【推荐2】如图,在▱ABCD中,点O为对角线BD的中点,EF过点O且分别交AB、DC于点E、F,连接DE、BF.
(1)△DOF≌△BOE;
(2)DE=BF.
(1)△DOF≌△BOE;
(2)DE=BF.
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