阅读下面材料,完成相应任务:
尺规作图
尺规作图是指用无刻度的直尺和圆规进行作图.无刻度的直尺不具有度量长度的功能,它用来作经过两点的直线,射线或线段.圆规用来画弧,圆规的两脚还可以截取线段或两点之间的长度.尺规作图的关键是确定线与线,线与弧,弧与弧的交点,从而构造出符合要求的图形.
在数学课上,在用尺规作角的平分线时,同学们自主探究出很多不同于教材的作法.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/ab291480-6c0a-449e-b6f8-1cafcb032555.png?resizew=143)
已知:
求作:
的平分线.
小明的作法:如图①,在射线
上取点
,分别以
为圆心,
长为半径画弧,交射线
于点
,连接
交于点
,过点
画射线
,则射线
为
的平分线.
小华的思路:如图②,在
上任取一点
,在
的右侧作射线
,使得
,在射线
上取一点
,使
,过点
画射线
,则射线
是
的平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/2cc60164-fdf8-46eb-9cf6-42fed9058a3e.png?resizew=301)
赵老师因势利导,引导同学们对各种作法进行研究,在感受教材作法简洁的同时体会它们的共同之处,即基于角的轴对称性构造全等三角形,得出两个相等的角.
任务一:小明的作法中,可以得出
,请你写出这一结论所依据的数学定理或基本事实.
任务二:根据小华的思路完成下列问题:
(1)使用直尺和圆规,在图②中补全图形(保留作图痕迹);
(2)根据小华的作法,证明
是
的平分线.
尺规作图
尺规作图是指用无刻度的直尺和圆规进行作图.无刻度的直尺不具有度量长度的功能,它用来作经过两点的直线,射线或线段.圆规用来画弧,圆规的两脚还可以截取线段或两点之间的长度.尺规作图的关键是确定线与线,线与弧,弧与弧的交点,从而构造出符合要求的图形.
在数学课上,在用尺规作角的平分线时,同学们自主探究出很多不同于教材的作法.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/ab291480-6c0a-449e-b6f8-1cafcb032555.png?resizew=143)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
小明的作法:如图①,在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdba36d4c2d4acedbd44d08e4c04127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da58a347512f4fc726cba055312c00b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec38bedb55b02c42c1fb552e6cbf7a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5557e3f084429321ddea623574d26e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
小华的思路:如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667db777bce5dc053916871fce18ec9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e795d041c170e2a62ff1157becd7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/30/2cc60164-fdf8-46eb-9cf6-42fed9058a3e.png?resizew=301)
赵老师因势利导,引导同学们对各种作法进行研究,在感受教材作法简洁的同时体会它们的共同之处,即基于角的轴对称性构造全等三角形,得出两个相等的角.
任务一:小明的作法中,可以得出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675ce3a46689f8f49c18059ed537503.png)
任务二:根据小华的思路完成下列问题:
(1)使用直尺和圆规,在图②中补全图形(保留作图痕迹);
(2)根据小华的作法,证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
更新时间:2024-01-30 18:12:31
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】完成下面推理过程.
在括号内、横线上填空或填上推理依据.
如图,已知:
,
,
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/201008f9-1ace-472d-b413-bf6bd7960e7d.png?resizew=154)
证明:∵
(已知)
∴
______(______)
∵
(已知)
∴
______(______)
即![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444ee72016aa4f62bfa8caf78ed37240.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2368cd9e22cd2aa5b12ea5131d0d6f7f.png)
∵
(已知)
∴
______(______)
∴EF∥______(______)
∴
(______).
在括号内、横线上填空或填上推理依据.
如图,已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c539fd3ffbe24c7aeeebd775c94b10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02194e887cefaf9825b6f74c9a2f5d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/201008f9-1ace-472d-b413-bf6bd7960e7d.png?resizew=154)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79cf20152c251b47f67e7ec17b6dbdb5.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c539fd3ffbe24c7aeeebd775c94b10.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75837616be61925438d59ff7ad4e87ea.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444ee72016aa4f62bfa8caf78ed37240.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2368cd9e22cd2aa5b12ea5131d0d6f7f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02194e887cefaf9825b6f74c9a2f5d9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11257c1c0f00b29bad943dd312af11c3.png)
∴EF∥______(______)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】P是三角形
内一点,射线PD//AC ,射线PB//AB .
(1)当点D,E分别在AB,BC 上时,
①补全图1:
②猜想
与
的数量关系,并证明;,
![](https://img.xkw.com/dksih/QBM/2019/8/23/2275033897984000/2275072059375616/STEM/1a222eca1e034ea69ed06827f80d419a.png?resizew=182)
(2)当点
都在线段
上时,请先画出图形,想一想你在(1)中所得结论是否仍然成立?若成立,请证明;若不成立,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(1)当点D,E分别在AB,BC 上时,
①补全图1:
②猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2b669a87f18866b2e9560f7fe1776d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/2019/8/23/2275033897984000/2275072059375616/STEM/1a222eca1e034ea69ed06827f80d419a.png?resizew=182)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db7c08836b6577b49677115aefe31f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2019/8/23/2275033897984000/2275072059375616/STEM/c8d22fd9115a40aa894a65219e0a750a.png?resizew=202)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,四边形
是正方形,对角线
,
相交于点
,
,
分别是边
,
上的动点,且
,连接
,
分别交对角线
于点
,
,连接
,
.
.
(2)当点
,
分别在
,
的什么位置时?四边形
是平行四边形,并说明理由.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:在
中,
,
,对角线
,
相交于点
.点
是线段
上一动点(不与
、
重合),连接
,以
为边在
的右侧作
,且
,
.
![](https://img.xkw.com/dksih/QBM/2019/9/20/2294808318656512/2294855974756352/STEM/fcc6eeb5ae39459fa830c5718321c9e5.png?resizew=411)
(1)如图①,若点
落在线段
上,则线段
与线段
的数量关系是______;
(2)如图②,若点
不在线段
上,(1)中的结论是否成立?若成立,请证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c161375e4e6f61f1cbef8083c02e975.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8204eaede51c9af72234220ab06eb50b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72aeb093f5b0cc2fb0cb0e662d0c9889.png)
![](https://img.xkw.com/dksih/QBM/2019/9/20/2294808318656512/2294855974756352/STEM/fcc6eeb5ae39459fa830c5718321c9e5.png?resizew=411)
(1)如图①,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】作图题(不写作法,保留作图痕迹):
(1)尺规作图:校园有两条路OA、OB,在交叉路口附近有两块宣传牌C、D,学校准备在这里安装一盏路灯,要求灯柱的位置P离两块宣传牌一样远,并且到两条路的距离也一样远,请你帮助画出灯柱的位置P.(不写画图过程,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2017/11/17/1819084659212288/1819375175049216/STEM/990e53293d52463aad90cbab91631f30.png?resizew=196)
用直尺和圆规在如图所示的数轴上作出表示
的点.
(1)尺规作图:校园有两条路OA、OB,在交叉路口附近有两块宣传牌C、D,学校准备在这里安装一盏路灯,要求灯柱的位置P离两块宣传牌一样远,并且到两条路的距离也一样远,请你帮助画出灯柱的位置P.(不写画图过程,保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2017/11/17/1819084659212288/1819375175049216/STEM/990e53293d52463aad90cbab91631f30.png?resizew=196)
用直尺和圆规在如图所示的数轴上作出表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8260f52b67803aec16ef3015db5e564.png)
![](https://img.xkw.com/dksih/QBM/2017/11/17/1819084659212288/1819375175049216/STEM/8011c10909044b91bbeb459e8572bb1e.png?resizew=366)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
,
.
,使得点
到
、
两边的距离相等,且点
到
,
两点的距离也相等;(保留作图痕迹,不写作法)
(2)若
,求点
到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7013cc4303c7ac5d0f03c85423f0c258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63447ea996b9036a7a7ae726cc382cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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适中
(0.65)
名校
【推荐1】新定义:如图1和图2中,点P是平面内一点,如果
或
,称点P是线段
的友好点.
(1)如图3,
中,
,
,问:点F是否是线段
的友好点?请说明理由.
(2)如图4,
中,
,F是线段
的友好点
,
是
的角平分线,求证:点H是线段
上的友好点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172dc6582e149aaef31b4ddb7953c6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d0a3316cc9f2188609894fdffa51de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/ebd52933-634b-47bd-a614-683f50d8eb68.png?resizew=520)
(1)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73fbc2f33d3402cd96a776a376d9835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01fb7cc752222306029fabbeb894a800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691048ce61c91a8a3680fa3025193160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73fbc2f33d3402cd96a776a376d9835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617d321a9e88d1001fba9283c89b99b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ee1f14d6d3e968ad0a9595fd96421ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73fbc2f33d3402cd96a776a376d9835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,在△ABC中,AB=AC,以AB为直径作⊙O,交AC于点F,交BC于点D,过点D作⊙O的切线DE,交AC于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/e40846b7-ca81-438d-9919-3e91cdedc3cf.png?resizew=154)
(1)求证:DE⊥AC;
(2)若⊙O的直径为5,
,求EF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/14/e40846b7-ca81-438d-9919-3e91cdedc3cf.png?resizew=154)
(1)求证:DE⊥AC;
(2)若⊙O的直径为5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362f8c132aba333cacee5bc8eddeeb0c.png)
您最近一年使用:0次