如图,四边形ABCD是菱形,点E是对角线BD上一点,求证:AE=CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/224142ff-9042-4043-b8d3-32b1366afd19.png?resizew=158)
2021·福建厦门·二模 查看更多[4]
2021年福建省厦门市松柏中学九年级中考二模数学试题福建省福州第十九中学2020-2021学年九年级上学期数学开门考数学试卷福建省福州市第十九中学2020-2021学年九年级下学期开学考数学试卷(已下线)卷2-备战2022年中考数学【名校地市好题必刷】全真模拟卷(福建专用)·第一辑
更新时间:2021-09-02 11:06:43
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【推荐1】如图,在
和
中,点D在边
上,下面有四个条件:①
,②
,③
,④
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/541dac5b-a2ec-4a89-b016-f633ae272cf2.png?resizew=156)
(1)从中选三个作为题设,余下的一个作为结论,组成一个真命题,将你选择的条件和结论的序号分别填写在对应的横线上,已知: ,求证: ;
(2)请对你写出的命题进行证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffb7fe544f80e589b9f932077e8ed95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bacdf8e36b05087d588dab377895f47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/541dac5b-a2ec-4a89-b016-f633ae272cf2.png?resizew=156)
(1)从中选三个作为题设,余下的一个作为结论,组成一个真命题,将你选择的条件和结论的序号分别填写在对应的横线上,已知: ,求证: ;
(2)请对你写出的命题进行证明.
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名校
【推荐2】如图,某海岸沿线有
,
两个码头,在该海域内有两座小岛
,
,航线
与
相交于点
,经测量,
,
,求证:
.
![](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/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f833649d010895fb30eb0b14de26074d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/5bf90e89-570c-4072-a127-140aeec0f2f0.png?resizew=188)
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名校
【推荐1】如图,在菱形
中,对角线
,
相交于点
,
,垂足为
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/e98e5a08-fa5b-4ff4-82e2-bc1d95a45487.png?resizew=151)
(1)求证:
.
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7672022057a656c5638e6e384dc630cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/e98e5a08-fa5b-4ff4-82e2-bc1d95a45487.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb902d303590aabafa8dc6daea43e35f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb6823a329628699619a39cde927510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐2】如图,在菱形
中,
为
上一点,
与
相交于点
.
(1)求证:
;
(2)如果
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/cfe009bb-45c6-48c4-9459-87c23cd90411.jpg?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab0ed2ff83ee76756d4f71579e155f5.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f6709d1847424174ff5cda40b9ec93.png)
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【推荐3】问题情境:通过对《平行四边形》一章内容的学习,我们认识到矩形、菱形、正方形都是特殊的平行四边形,它们除了具有平行四边形的性质外,还有各自的特殊性质.根据它们的特殊性,得到了这些特殊的平行四边形的判定定理.数学课上,老师给出了一道题:如图①,矩形
的对角线
,
交于点O,过点D作
,且
,连接
.
(1)判断四边形
的形状,并说明理由.
深入探究:
(2)如图②,若四边形
是菱形,(1)中的结论还成立吗?请说明理由.
拓展延伸:
(3)如图③,若四边形
是正方形,四边形
又是什么特殊的四边形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86bc2fdcdc187a7fe51a7f40b04c9eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75934440ed302198fb9db60e120af93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39a4d3936f26f94f4e85a1be4eefd66.png)
深入探究:
(2)如图②,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展延伸:
(3)如图③,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39a4d3936f26f94f4e85a1be4eefd66.png)
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