课本再现:
(1)如图1,
分别是等边三角形的两边
上的点,且
.求证:
.下面是小涵同学的证明过程:
证明:
是等边三角形,
.
,
,
.
小涵同学认为此题还可以得到另一个结论:
的度数是______;
迁移应用:
(2)如图2,将图1中的
延长至点
,使
,连接
.利用(1)中的结论完成下面的问题.
①求证:
;
②若
,试探究
与
之间的数量关系.
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f76f6531524d4f34e30899dc492b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0093b2067b6be3033c4345609c169a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b6cf4a15debec25bb89083b846509a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17eb66fbb6465a53b41789fd6410920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218c2358f05a2d613255c7538958afb9.png)
小涵同学认为此题还可以得到另一个结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
迁移应用:
(2)如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3456561f6be8e1dc20870fb89f10c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6fccaa7450b43eeb3968c05792225a.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b297959d7e4a664af721652608fae619.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6556e846720087cc050b5ff5be712c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
2024·江西上饶·一模 查看更多[1]
更新时间:2024-05-11 11:11:03
|
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适中
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【推荐1】如图,
,
,
,
,
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上.
(1)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/16baf29c-e9ad-4712-9ad6-c5f75fbdede7.png?resizew=210)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ffef5b03f222606683bba937060d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907938d75b295027e599da1f7635755c.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在菱形
中,
,点
是射线
上一动点,以
为边向右侧作等边
,点
的位置随着点
的位置变化而变化.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/0074d735-7048-4f19-b624-2003fab5f230.png?resizew=610)
(1)问题发现如图
,当点
在菱形
内部或边上时,连接
,
与
的数量关系是______;
与
的位置关系是______;
(2)拓展探究
如图
,当点
在菱形
外部时,(1)中的结论是否还成立?若成立,请予以证明;若不成立,请说明理由;
(3)解决问题
如图
,若
,
,请直接写出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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(1)问题发现如图
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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(2)拓展探究
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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(3)解决问题
如图
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,AB是⊙O的直径,弦CD⊥AB于点E,在⊙O的切线CM上取一点P,使得∠CPB=∠COA.
![](https://img.xkw.com/dksih/QBM/2019/11/18/2336508642451456/2337434017177600/STEM/6768dbcf4c8f44d0bf702a2b33fcd62b.png?resizew=143)
(1)求证:PB是⊙O的切线;
(2)若CD=6,∠AOC=60°,求PB的长.
![](https://img.xkw.com/dksih/QBM/2019/11/18/2336508642451456/2337434017177600/STEM/6768dbcf4c8f44d0bf702a2b33fcd62b.png?resizew=143)
(1)求证:PB是⊙O的切线;
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在菱形
中,
,
,点E是边
的中点,点M是
边上一动点(不与点A重合),延长
到N,使得
,连接
,
,
.
(1)求证:点C,D,N在同一条直线上;
(2)填空:
①当
的值为 时,四边形
是矩形;
②当
的值为 时,四边形
是菱形.
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(1)求证:点C,D,N在同一条直线上;
(2)填空:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a6fa5218491da01843cdfde0c3dcbd.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在菱形
中,E为
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.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/ab41d51b-1956-4480-bdf9-4a4bccfa8126.png?resizew=195)
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;
(2)若
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的边长.
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(2)若
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,
,
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.
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(1)若
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
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(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
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您最近一年使用:0次