如图,已知AB=AC,AD=AE,BD和CE相交于点O.请判断△BOC的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/3/59bcdbdf-657b-4e84-af29-92e370392d4f.png?resizew=117)
更新时间:2021-11-26 16:31:28
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相似题推荐
解答题-证明题
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【推荐1】如图,已知
都是等腰直角三角形,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/8a344899-b240-45b3-8188-d3090d4305ff.png?resizew=217)
(1)求证:
;
(2)若延长
交
于点F,试判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba609e8d47d6f4a51c454db50693192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/25/8a344899-b240-45b3-8188-d3090d4305ff.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e0e554b89644d787a2eeec4b130c5a.png)
(2)若延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】如图,在等边ΔABC的边BC上任取一点D,以CD为边向外作等边ΔCDE,联结AD、BE.求证:BE=AD.
![](https://img.xkw.com/dksih/QBM/2020/4/9/2437927221952512/2437985627635712/STEM/38e225be-fc42-4df9-a0a4-4052e7d00335.png)
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解答题-作图题
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【推荐1】如图1,在面积为
的等腰直角
中,
,点Q从点A开始沿
边向点B以
的速度移动,点P从点C开始沿
边向点A以
的速度移动,且P,Q两点同时出发,当其中一个点到达终点时,另一个点也停止运动,设点P运动的时间为
.
(1)当t为何值时,
为等腰直角三角形?
(2)若
的面积为
.
①求出S与t之间的函数关系式,并直接写出自变量t的取值范围,在图2中画出其草图;
②直接写出S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70795d95fe0fc32a37eebf00a9bba27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/6e4200d8-bccf-4995-a543-c92661e51044.png?resizew=483)
(1)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499b1f470978c4f8cc05ffdebc2e961.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499b1f470978c4f8cc05ffdebc2e961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30ecfda698212594a342565257dc5508.png)
①求出S与t之间的函数关系式,并直接写出自变量t的取值范围,在图2中画出其草图;
②直接写出S的最大值.
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解答题-证明题
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名校
【推荐2】已知:四边形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
平分
,交
于
,且
,
延长线交
于
,
,
.
(1)求证:
;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827d77011af6d7cbfca37ed0f8229526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f081eb23d83e39c604fd0e240210559d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7fa3aea72ccc36948a4a90f7368f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2ab8b9338fbcdf04d0e703337ea34f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/6/2fa6e62f-8d0d-4769-b81f-b72fec0be42c.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719de5b1a46e59e73fc7553519308fa2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866c62dc4645a222c5d7572c3699ed60.png)
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