已知
和
是等腰直角三角形,
,点
为
中点,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/d750ce5d-8f25-4177-80d4-d09530032b87.jpg?resizew=445)
(1)如图1所示,当点
在
上,点
在
上,此时线段
与
的数量关系是 ,
与
的位置关系是 .
(2)如图2所示,在(1)的条件下将
绕点A逆时针旋转
时,请证明此时(1)中
与
的数量关系与位置关系仍然成立.
(3)如图3,在(1)的条件下将
绕点A逆时针旋转
时,连接
,设
中点为G,连接
.若
,求此时线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/d750ce5d-8f25-4177-80d4-d09530032b87.jpg?resizew=445)
(1)如图1所示,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)如图2所示,在(1)的条件下将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(3)如图3,在(1)的条件下将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b452f1753b2d2703295238521ad922f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
更新时间:2023-11-07 15:29:58
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】在
中,
是
边上的高,
,
,
,点M在
上,且
,动点P从点A出发,沿折线
以每秒1个单位长度的速度运动,连接
,作点A关于直线
的对称点
,设点P的运动时间为t秒
.
(1)用含t的代数式表示线段
的长.
(2)当点
在
内部时,求t的取值范围.
(3)连接
,当
时,求
的面积.
(4)当
时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810fee760e06028fb7d37e65db79bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9536b51bbdc96d70732e065b64678bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cea72e0c37257bcfd85a59ef8dd0f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/09f7d3ba-d4f8-4c01-8b26-377b5b8f08c8.png?resizew=181)
(1)用含t的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2e118d8156830746055c1b2e759ab0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2f9ce7c382455f3048d8db2f3b9003.png)
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【推荐2】(1)如图1,将直角的顶点E放在正方形ABCD的对角线AC上,使角的一边交CD于点F,另一边交CB或其延长线于点G,求证:EF=EG;
(2)如图2,将(1)中的“正方形ABCD”改成“矩形ABCD”,其他条件不变.若AB=m,BC=n,试求
的值;
(3)如图3,将直角顶点E放在矩形ABCD的对角线交点,EF、EG分别交CD与CB于点F、G,且EC平分∠FEG.若AB=2,BC=4,求EG、EF的长.
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574195971604480/1574195978190848/STEM/c4a56b024c494ee792e5c9410301ed8c.png)
考点:四边形综合题.
(2)如图2,将(1)中的“正方形ABCD”改成“矩形ABCD”,其他条件不变.若AB=m,BC=n,试求
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574195971604480/1574195978190848/STEM/4e9463c505aa43d2913c4f628a9e0636.png)
(3)如图3,将直角顶点E放在矩形ABCD的对角线交点,EF、EG分别交CD与CB于点F、G,且EC平分∠FEG.若AB=2,BC=4,求EG、EF的长.
![](https://img.xkw.com/dksih/QBM/2016/4/21/1574195971604480/1574195978190848/STEM/c4a56b024c494ee792e5c9410301ed8c.png)
考点:四边形综合题.
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【推荐3】已知如图,抛物线y=-
x2+2x+
与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,点D为抛物线的顶点,对称轴交x轴于点E.
(1)如图①,连接BD,试求出直线BD的解析式;
(2)如图②,点P为抛物线第一象限上一动点,连接BP,CP,AC,当四边形PBAC的面积最大时,线段CP交BD于点F,求此时DF∶BF的值;
(3)如图③,已知点K(0,-2),连接BK,将△BOK沿着y轴上下平移(包括△BOK),在平移的过程中直线BK交x轴于点M,交y轴于点N,则在抛物线的对称轴上是否存在点G,使得△GMN是以MN为直角边的等腰直角三角形,若存在,请直接写出点G的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
(1)如图①,连接BD,试求出直线BD的解析式;
(2)如图②,点P为抛物线第一象限上一动点,连接BP,CP,AC,当四边形PBAC的面积最大时,线段CP交BD于点F,求此时DF∶BF的值;
(3)如图③,已知点K(0,-2),连接BK,将△BOK沿着y轴上下平移(包括△BOK),在平移的过程中直线BK交x轴于点M,交y轴于点N,则在抛物线的对称轴上是否存在点G,使得△GMN是以MN为直角边的等腰直角三角形,若存在,请直接写出点G的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/3/28/2687866564739072/2688150943162368/STEM/2c1aa8f0-26c6-40d3-bf40-0df49850ff13.png)
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(0.15)
名校
【推荐1】在
中,
,
,D是边
上一动点(D不与A、C两点重合),连接
.
(1)如图1,当
平分
时,若
,求
的长;
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120143091441664/3125897774768128/STEM/e76ab3ecb8e14e22869c45c6e7a38469.png?resizew=215)
(2)如图2,将
绕点D顺时针旋转
,得到
,连接
,取
的中点F,连接
.
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120143091441664/3125897774768128/STEM/f7c53ac0fa084043ae8c0f59669bc492.png?resizew=199)
①猜想
与
的数量关系,并证明你的猜想;
②如图3,点K在边
上,且
,连接
.当
取最小值时,直接写出
的值.
![](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/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120143091441664/3125897774768128/STEM/e76ab3ecb8e14e22869c45c6e7a38469.png?resizew=215)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120143091441664/3125897774768128/STEM/f7c53ac0fa084043ae8c0f59669bc492.png?resizew=199)
①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
②如图3,点K在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c37a31a19a8bd2581c96bb22bd35750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ac28c7adade476df476c2bf90a8416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ac28c7adade476df476c2bf90a8416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9af91834644b94e1b023b33e15a0644.png)
![](https://img.xkw.com/dksih/QBM/2022/11/29/3120143091441664/3125897774768128/STEM/706d609c730b4bc6b71eee1cb8ce7958.png?resizew=204)
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困难
(0.15)
名校
【推荐2】在正方形
中,将线段BA绕着点B旋转α(
),得到线段
,连接
.
(1)如图1,若
,连接
,求证:
;
(2)如图2,若
,过点A作
交
延长线于点G,连接
,
,猜想线段
之间存在的数量关系,并证明你的猜想;
(3)如图3,在线段
旋转的过程中,直线
交于点M,过点A作
交直线
于点G,直线
交于点N.若
,当线段
取得最小值时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824513ba3c12cec2601b75e831e8b4de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/22/351beda3-d536-46d1-9885-89085c86f61c.png?resizew=521)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b75ced646be2a6bb12d2077b2e2427e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f19889892fad9cfb3fa18eba971fb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10307f49b923a8cb397d77d76075d05.png)
(3)如图3,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673e677c7ce6ef5fbbeda5eb47f56210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f19889892fad9cfb3fa18eba971fb52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874f18ad047c9a53dc2b62c4683881e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5aedb7470128f1782be91f5f444a6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dadd960fdef00a1100d4a49b69edcb6c.png)
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【推荐1】如图,点O是△ABC内一点,连接OB、OC,线段AB、OB、OC、AC的中点分别为D、E、F、G.
(1)判断四边形DEFG的形状,并说明理由;
(2)若M为EF的中点,OM=2,∠OBC和∠OCB互余,求线段BC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/6b143d78-d727-46f4-a68d-ea188c495f03.png?resizew=126)
(1)判断四边形DEFG的形状,并说明理由;
(2)若M为EF的中点,OM=2,∠OBC和∠OCB互余,求线段BC的长.
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名校
【推荐2】如图,在
中,
,
,
,D为边AB的中点,动点P从点A出发,以每秒2个单位长度的速度沿折线
向终点B运动.当点P不与点C重合时,连结PD,以CP,PD为边作
,设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/cd79afcd-f1f5-4d9a-a8ee-e82e5f73e499.png?resizew=194)
(1)C、D两点之间的距离为________;
(2)当
为矩形时,求t的值
(3)当点P在边AC上运动时,
①求点P到CD的距离为________;(用含t的代数式表示)
②设
的对角线的交点为O,点D关于对角线PE的对称点为
,连结
,当
平行Rt△ABC一边时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2d58317c533f9ec5e5722e7a5d1618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ab1703f19779a76dd7d15a8a117650.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/cd79afcd-f1f5-4d9a-a8ee-e82e5f73e499.png?resizew=194)
(1)C、D两点之间的距离为________;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ab1703f19779a76dd7d15a8a117650.png)
(3)当点P在边AC上运动时,
①求点P到CD的距离为________;(用含t的代数式表示)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ab1703f19779a76dd7d15a8a117650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142e0f0e25dc2ad81ec1a7ec6ed866b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142e0f0e25dc2ad81ec1a7ec6ed866b.png)
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解答题-问答题
|
困难
(0.15)
名校
【推荐1】如图,在等腰
中,
,
,
为
上一点.
(1)如图1,若
为
的中点,
为
延长线上的一点,连结
,点
为
的中点,连结
交
于点
,连结
交
延长线于点
,且
,求证:
;
(2)在(1)的条件下,求证:
;
(3)如图2,连结
,将
绕点
顺时针旋转
得到线段
,连结
交
于点
,交
于点
,点
是
上一点,连结
,以
为斜边在其右侧作
,且
,
,连结
交
于点
,当点
、
的距离最小时,请直接写出
与四边形
的面积之比.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/24/b10588a5-b592-49d0-bd6d-1111ba040a93.png?resizew=474)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999a995a6d07c561ce64e8952994160a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8414df9698605d40b89f5c0d24932b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb3d775ef4f0e13d27e278dc768b255.png)
(2)在(1)的条件下,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b37a775f9558ca15027d15a25d73af.png)
(3)如图2,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a022d9ed35c8ce5ce01c2663a7115f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f497ad3de217d07747970029c36ed82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6e9c780bfcfe18f6d49507c774b856.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9b0d3cf342e065b4c8e21443bfbfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae0ea5e99da7b096aed5fb380047e12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3851f46d489e29ba62165f101b1f5039.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐2】(1)阅读理解:如图1,等边
内有一点P,若点P到顶点A,B,C的距离分别为3,4,5,求
的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/6a709e64-57ee-44e8-abbe-8f39b226597c.png?resizew=520)
思路点拨:考虑到
不在一个三角形中,采用转化与化归的数学思想,可以将
绕顶点A逆时针旋转60°到
处,此时
,这样,就可以利用全等三角形知识,结合已知条件,将三条线段的长度转化到一个三角形中,从而求出
________
(2)变式拓展:请你利用第(1)问的解答思想方法,解答下面问题:
如图2,在
中,
,E、F为BC上的点且
,求EF的大小.
(3)能力提升:如图3,在
中,
,点O为
内一点,连接
,且
,请直接写出
_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/6a709e64-57ee-44e8-abbe-8f39b226597c.png?resizew=520)
思路点拨:考虑到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bb1063e139610045f3bca5ca0b2766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3705d3880f38b917cc7f93e3fc32789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e23afd6317cd8509a3e6f1d415b568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a84b7de4bcbaa36f542b7ac3886bba.png)
(2)变式拓展:请你利用第(1)问的解答思想方法,解答下面问题:
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e362efcfcac802f5ba14deac8dd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b7f7776ae3df98a39eafc023fe90df.png)
(3)能力提升:如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105c9fc1f514b9e95b7a1ba4a7666c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461fa3d2a6fbe227af4b35e764464a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2765ee49bfe09fed44327e8be2347dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b43abaca52f88dcf2868ab8b227d995.png)
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