如图,在
中,
,
,
,
,
三点共线,点
在
上,
,
,
分别交
于
,
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/a7e128ea-efdd-49fa-87d0-847bef19fa65.png?resizew=412)
(1)求证:
;
(2)若
.
①求证:
;
②探究
,
与
的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d565c67e4af87152bfaf4faacb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/a7e128ea-efdd-49fa-87d0-847bef19fa65.png?resizew=412)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8675b1f836681090a356709ac4ebac8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c48bc22ce80802f1ac0c6fa1ba9f666.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a52293be17e6a02f9b338f25b6cacd.png)
②探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
更新时间:2024-03-05 14:18:50
|
相似题推荐
解答题-问答题
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较难
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【推荐1】在等边
ABC中,点D、E分别是AB、AC上的点,BD=AE,BE与CD交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/51b750fb-a43e-40fc-b52f-e333d1d3cb9b.png?resizew=616)
(1)如图1,填空:∠BOD= °;
(2)如图2,以CO为边作等边
OCF,连接AO、BF,那么BF与AO相等吗?并说明理由;
(3)如图3,在(2)的条件下,若点G是BC的中点,连接GO,判断BF与GO有什么数量关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/51b750fb-a43e-40fc-b52f-e333d1d3cb9b.png?resizew=616)
(1)如图1,填空:∠BOD= °;
(2)如图2,以CO为边作等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)如图3,在(2)的条件下,若点G是BC的中点,连接GO,判断BF与GO有什么数量关系?并说明理由.
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【推荐2】已知四边形![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/3bec4151-ba2a-4f59-8e42-69322dec6ede.png?resizew=449)
(1)如图1:
,
.求证:
;
(2)如图2:在(1)的条件下,取
上一点
作为顶点作直角
,使直角的两边交
于
,交
于
.则
________.(直接写出角度和)
(3)如图3:在(2)的条件下,
上存在点
,
,连接
,延长
交
延长线于
,若
、
恰好平分
、
,且
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/3bec4151-ba2a-4f59-8e42-69322dec6ede.png?resizew=449)
(1)如图1:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
(2)如图2:在(1)的条件下,取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa70e7c9ef8b856b494d370b7d76482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b382f1d651b55e68ba9df45cc8d27fe.png)
(3)如图3:在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86053908483d07c5ea3da57b8ad7ef11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3137705cb4170baafa66ff46eefb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96461af9193d5d7867ddf8fcbefcaec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca1d09859dfab140e55e3cc3e7d67d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82bf8f29e486ec388107b497520391c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8fae532fd2d1aec759f06bf5a3a5d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0feb0b8ec2bb476a1c7bf1b600b29e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e50fb62d5dcf1077a2fe4ddd6f9f605.png)
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解答题-问答题
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较难
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【推荐1】如果三角形的两个内角
与
满足
,那么我们称这样的三角形为“准直角三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/e2fbfad6-1547-4684-b9d1-4e835fbff03d.png?resizew=370)
(1)若
是“准直角三角形”,
,
,则
______
;
(2)如图1,在
,
是
的角平分线,判断:
___(填“是”或“不是”)“准直角三角形”;
点
是边
上一点,
是“准直角三角形”,若
,则
的度数是______ .
(3)如图2,
、
直线
上两点,点A在直线
外,且
,若
是
上一点,且
是“准直角三角形”,请求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106f8de7fde5a4d67448debb9437194e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/e2fbfad6-1547-4684-b9d1-4e835fbff03d.png?resizew=370)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c554100e16141964f74a5a743f6b29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa97419c78abe03b0da100780c5d4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fdd7a7dcc801f20d1b59fe1798bff07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db17133623795a0e65d9c61745d63187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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解答题-证明题
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【推荐2】如图所示,在等腰
ABC中,延长边AB到点D,延长边CA到点E,连接DE,恰有AD=BC=CE=DE.求证:∠BAC=100°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/3/29/2688294748708864/2695580564029440/STEM/f988e3f8-bd12-4524-af38-814657153528.png)
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名校
【推荐1】已知:如图,四边形
内接于
,连接
,
平分
.
![](https://img.xkw.com/dksih/QBM/2023/4/22/3222216916738048/3227075991404544/STEM/735bd2814b384b95aa54e2c2b13695c8.png?resizew=424)
(1)如图1,求证:
;
(2)如图2,连接
并延长,交
于点E,求证:
;
(3)如图3,连接
,
,
,若
的面积为30,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://img.xkw.com/dksih/QBM/2023/4/22/3222216916738048/3227075991404544/STEM/735bd2814b384b95aa54e2c2b13695c8.png?resizew=424)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
(3)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6548e64daac2f8764c002ea2d7830d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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解题方法
【推荐2】已知:在
中,
,以
为斜边作等腰
,使得A,D两点在直线
的同侧,过点D作
于点E.
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710113654743040/2710178298503168/STEM/51880501-636c-4362-9fa4-264866416344.png?resizew=243)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710113654743040/2710178298503168/STEM/0fe5e760-378e-4310-935d-69587fccdc74.png?resizew=208)
(1)如图1,当
时,
①求
的度数;
②判断线段
与
的数量关系;
(2)若
,线段
与
的数量关系是否保持不变?依题意补全图2,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5f757093b1d9917968d19706abdccea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a833075a02fa16c3a54688b224abf305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710113654743040/2710178298503168/STEM/51880501-636c-4362-9fa4-264866416344.png?resizew=243)
![](https://img.xkw.com/dksih/QBM/2021/4/29/2710113654743040/2710178298503168/STEM/0fe5e760-378e-4310-935d-69587fccdc74.png?resizew=208)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7209c73ac82338a7def4decc693dc633.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
②判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df61e1f0cfc78a10741922d9dc43973.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】如图,在△ABC中,AB=AC=6,BC=8,点D是BC边上的一个动点,点E在AC上,点D在运动过程中始终保持∠1=∠B,设BD的长为x(0<x<8).
(2)用含x的代数式表示CE的长;当CE=2时,求x的值;
(3)当x为何值时,△ADE为等腰三角形(直接写出结果).
(2)用含x的代数式表示CE的长;当CE=2时,求x的值;
(3)当x为何值时,△ADE为等腰三角形(直接写出结果).
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【推荐2】已知:三角形ABC中,∠A=90°,AB=AC,D为BC的中点.
(1)如图,E、F分别是AB、AC上的点,且BE=AF,求证:△DEF为等腰直角三角形.
(2)若E、F分别为AB,CA延长线上的点,仍有BE=AF,其他条件不变,那么,△DEF是否仍为等腰直角三角形?画出图形,写出结论不证明.
(1)如图,E、F分别是AB、AC上的点,且BE=AF,求证:△DEF为等腰直角三角形.
(2)若E、F分别为AB,CA延长线上的点,仍有BE=AF,其他条件不变,那么,△DEF是否仍为等腰直角三角形?画出图形,写出结论不证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/92cf7d6f-2080-499b-b08d-d65a906310cd.png?resizew=165)
您最近一年使用:0次