如图,在等腰三角形
中,
,D是
边上的一个动点,(不与B、C重合)在
边上取一点E,使
.
(1)求证:
;
(2)设
,求y关于x的函数关系式并写出自变量x的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93218586f810fd9cf345548ea7470f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3b58a4087b4a569572d93feceaec1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/5bc688b3-b30b-4da3-b16e-eb94bfa159c0.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfb7665a54463b68487b6c53cdd97b3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3831b141230d8433e115d88a55eb6364.png)
更新时间:2023-12-09 20:48:28
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图所示,已知平行四边形
的周长为
,
,若边长
.
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075451966201856/2075578706305024/STEM/c1643257ac874deea5dc8a23d8bea8ac.png?resizew=128)
写出
的面积
与
的函数关系式,并求自变量
的取值范围.
当
取什么值时,
的值最大?并求最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd00e8a0d30ec16562b7ffc317ffb56b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1265bb822b6cbc416a4f77ad5916025.png)
![](https://img.xkw.com/dksih/QBM/2018/11/14/2075451966201856/2075578706305024/STEM/c1643257ac874deea5dc8a23d8bea8ac.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65fe4c2ebf21dc2a14de0fd17d5b6fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图,用一段长为
米的篱笆围成一个一边靠墙的矩形苗圃园,已知墙长为
米,设这个苗圃园垂直于墙的一边长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/bc7b2ed7-e121-46a7-b214-69eed1ad8471.png?resizew=199)
(1)若苗圃园的面积为
平方米,求
的值.
(2)若平行于墙的一边长不小于
米,当
取何值时,这个苗圃园的面积有最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/bc7b2ed7-e121-46a7-b214-69eed1ad8471.png?resizew=199)
(1)若苗圃园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6620729a37129c16cfd61cd59500bfe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若平行于墙的一边长不小于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-证明题
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适中
(0.65)
【推荐1】(1)模型探究:如图,点
、
分别是
的边
、
上的点,且
,点
在
上,连接
,交
于点
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/e284c69b-294a-40d7-861c-59143d920d43.png?resizew=300)
(2)模型运用:如图,在Rt
中,
,
于点
,点
是
中点,延长.
交
于点
,
于点
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/04af9f56-f6a5-42a9-bc83-430099d95025.png?resizew=314)
(3)观察思考:如图,在(2)的条件下,连接
,是否存在
?若存在,请求出此时
与
的数量关系;若不存在,请给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](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/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3cc7c8cd9b1db157268c07f4d64b2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/e284c69b-294a-40d7-861c-59143d920d43.png?resizew=300)
(2)模型运用:如图,在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
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(3)观察思考:如图,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/571f7188-e5f7-498f-8f6b-2061a40ec9c0.png?resizew=300)
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解答题-证明题
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【推荐2】如图,圆
、圆
为两个不相交的圆,记圆
的半径为
,圆
的半径为
,有
,E是两圆连心线上的一点,满足关系式
,点F、G为圆A上任意的动点,作直线EF、EG分别与圆C交于H、I、J、K四点,连接IK
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/9e343190-d999-4181-8515-8ee5b90c5478.png?resizew=360)
(1)设圆
、圆
的两条外的公切线分别为
,证明
总是在点E处相交;
(2)若固定
点,让
点在圆
上移动,证明:此时
的值与
的位置无关;
(3)当IK
时,连接
、
,设
与
交于
,证明
在
上,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/9e343190-d999-4181-8515-8ee5b90c5478.png?resizew=360)
(1)设圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50297ad9f7256b4d2efc3462289f18b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50297ad9f7256b4d2efc3462289f18b7.png)
(2)若固定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8a2d50806031a677d124e8ac388cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(3)当IK
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/659e5d79694df0d12ce6aca6bb522591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b375a47aa4ec53f6a501c465803c501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b375a47aa4ec53f6a501c465803c501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581d0c52f3b9848d9f57addaf3c6ad4d.png)
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