在
中,
,
点是
的中点,且
.
(1)求证:
;
(2)求
的长.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02623c5dab0c11b0b79e959f01d6613c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42074af1b0909e9dba0c626ea131a770.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/5/3/2454635020771328/2454788174266368/STEM/4419a280439b4676b9ab3f6c7e5df342.png?resizew=129)
更新时间:2020-05-03 15:42:14
|
相似题推荐
解答题-证明题
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适中
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【推荐1】定义:对角线互相垂直的圆内接四边形称为圆的神奇四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/d234d645-7690-4afe-9735-56cf3e2512d2.png?resizew=465)
(1)如图1,已知四边形
是
的神奇四边形,若
,
,则
__________;
(2)如图2,已知四边形
为
的内接四边形,连接
,
,
,
,满足
,求证:四边形
是
的神奇四边形;
(3)如图3,已知四边形
是
的神奇四边形,
,延长
,
相交于点E,若
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/d234d645-7690-4afe-9735-56cf3e2512d2.png?resizew=465)
(1)如图1,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11c85409e4c685f7dbadae2de3cf9a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32995b3d5327ca12ed93c5bd41678a4a.png)
(2)如图2,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed778bb43c96fc56fcf9ccdffa980fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如图3,已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】问题提出
(1)如图1,
是等腰三角形,点D,E分别在腰
上,且
,连接
.若
,则
的长为_______.
问题探究
(2)如图2,在平行四边形
中,
,
,E为线段
延长线上的一点,连接
,求证:
.
问题解决
(3)王叔叔家门前有一块四边形空地
,王叔叔计划用该空地开发一个种植基地,如图3,经测量,
米,
米,
米,
米,并测得
,请依据相关数据帮王叔叔计算该四边形空地
的面积.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf9a415bdb7b4e1e35c18a9e53205392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8518c9bd112f86afb26eec99b01934d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/658e79e7-5cfa-4823-9638-e755f6c47217.png?resizew=99)
问题探究
(2)如图2,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580a93c380d919150e893b85e934e809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8bb13740ac13266fe08f0f24948d5ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/4a68271c-8083-473b-b532-5191dc70ed3c.png?resizew=140)
问题解决
(3)王叔叔家门前有一块四边形空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbb91d806e628cf978557ffad6a7020.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe22891897d4249be7c8f37d0f9a65a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab5b86ac5dac95ba4dd12b4f3af54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35395d90e938ac17ec2763bd1cfd65cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/d30760c9-fe57-4ee5-90d5-7dcc5c1aa698.png?resizew=123)
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名校
【推荐1】如图,在边长为1的正方形网格上,有一个△ABC,它的各个顶点都在格子上,△ABC是直角三角形吗?为什么?
![](https://img.xkw.com/dksih/QBM/2019/5/25/2211436055568384/2212241065115648/STEM/5321165f87cf47b0ae27e5066407de8b.png?resizew=173)
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解答题-问答题
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【推荐2】如图,抛物线
与
轴交于
,
,与
轴交于点
.连接
,
,点
在抛物线上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/813a7f57-a979-4795-866b-436763075aea.png?resizew=120)
(1)求抛物线的表达式;
(2)若点
在第四象限,点
在
的延长线上,当
时,求点
的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/813a7f57-a979-4795-866b-436763075aea.png?resizew=120)
(1)求抛物线的表达式;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa095f2fab116a49f5b26af51ba1fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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