如图,矩形ABCD中,
,
,E为BC边上的动点,连接DE.过点E作
于点F,DE的中点为G,连接CF,CG,GF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/316b2daf-3b1c-4380-b39d-e496af3fc635.png?resizew=193)
(1)求证:
;
(2)求证:
;
(3)设
,
的面积为S,求S与x的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9228b213dc6b256b752b38a466ebec93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/8/316b2daf-3b1c-4380-b39d-e496af3fc635.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbeeabddf49c407dbfa76c6376164ca.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ababed449b4b67a75edbc89f04220617.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1dd8809233c90f66563c34f2164415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4364713d318c134525c76816cac75f27.png)
更新时间:2022-08-07 00:19:20
|
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解答题-作图题
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适中
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【推荐1】已知点
是第一象限内的点,且
,点A的坐标为
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(1)求S与x之间的函数解析式,并写出自变量的取值范围;
(2)画出函数图象.
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(1)求S与x之间的函数解析式,并写出自变量的取值范围;
(2)画出函数图象.
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解答题-问答题
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适中
(0.65)
【推荐2】某商店售货时.在进价的基础上加一定利润,其数量x与售价y之间的关系如下表所示,请你根据表中所提供的信息,列出售价y与数量x之间的关系式,并求出当数量x=2.5 kg时,售价y是多少元.
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解答题-证明题
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适中
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【推荐1】如图,正方形
的对角线
相交于O,
平分
,
于点F,交
于点G,
求证:
;
(2)
;
(3)若M为
得中点,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25046e366e62da8e9e8ee40b0c385b43.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9d53cca3cf6202538ccc330440dc4f.png)
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名校
【推荐2】如图,在离水面高度(AC)为2米的岸上有人用绳子拉船靠岸,开始时绳子与水面的夹角为30°,此人以每秒0.5米的速度收绳子.
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解答题-证明题
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适中
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【推荐2】在正方形
中,
是边
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不与点
、
重合),连结
.如图①,过点
作
交
于点
.易证
.(不需要证明)如图②,取
的中点
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作
交
于点
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于点
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![](https://img.xkw.com/dksih/QBM/2019/9/24/2297505828626432/2297554774343680/STEM/74bd06f28b3f482cbe0826dcfda99fc2.png?resizew=322)
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作
交
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,
于点
,连结
、
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的面积.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110458927f3f396a5bc27ea4a3b1a3e9.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee73d637e8260733851b10b322b9cd6.png)
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(3)如图③,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在矩形
中,
,
相交于点
,
,
.
![](https://img.xkw.com/dksih/QBM/2023/11/9/3364463196667904/3368405789147136/STEM/55c2d1efc93e44a28f7d9b714e60c9a8.png?resizew=183)
(1)求证:四边形
是菱形;
(2)若
,
,求
的长及四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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(1)求证:四边形
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20e9d6c7e003d1a312b722e5e7fd4c5.png)
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解答题-证明题
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【推荐2】如图,O是矩形ABCD对角线的交点,DE//AC,CE//BD.求证:OE与CD互相垂直平分.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/56802f6d-f690-4c33-b697-74bfc921dfc7.png?resizew=283)
您最近一年使用:0次