如图:在
中,
,
,点
为
的中点,点
为直线
上的动点(不与点
,
重合),连接
,
,以
为边在
的上方作等边
,连接
.
(1)
是________三角形;
(2)如图1,当点
在边
上时,运用(1)中的结论证明
;
(3)如图2,当点
在
的延长线上时,(2)中的结论是否依然成立?若成立,请加以证明,若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09df4b1fa6fd636f24daba8881232ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a355958abf7dc0f2eb949584cb87907b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f4bcb7ddcdbb66f0304d0531e84c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/828628c0876b45381c9a0edeb0fec236.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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7331c244ea96b2ef5f488f03f7d2b9e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48acde54fd48fbf883406e30972a07d.png)
(2)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d20346077938a108730e90caedb52.png)
(3)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/4/2887182985142272/2889175620026368/STEM/8ed48ac2-b121-49be-9327-b0b6031737ab.png?resizew=265)
更新时间:2022-01-07 09:05:45
|
相似题推荐
解答题-问答题
|
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名校
【推荐1】如图①,在四边形
中,
,点E是
上一点,连接
,若
是
的平分线,且
.
(1)试说明:
;
(2)如图②,将
沿
翻折,点D恰好落在
的中点F的位置,请判断
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520874a48aa2b3a98c2c343944f90264.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/9ea8a15d-f522-4248-a7ed-31fb25cf5657.png?resizew=426)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a122f10cc3788a7de4aa3fa5ad404760.png)
(2)如图②,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】如图,在
中,
,垂足为D,
,延长
至E.使得
,连接AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/ec8e99b2-05bb-49fa-8118-83f659f7c845.png?resizew=172)
(1)求证:
.
(2)若
,
,
①求
的面积.
②求
的周长,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03ca3e334c5290ab28b4b4a883c90c8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/ec8e99b2-05bb-49fa-8118-83f659f7c845.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84436aa1ceaa333f6236c35b6eb63ec0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
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【推荐1】如图,△ABC为等边三角形,AE=CD,AD交BE于点P,BQ⊥AD于Q.
(1)求证:AD=BE;
(2)设∠BPQ=α,那么α的大小是否随D、E的位置变化而变化?请说明理由;
(3)若PQ=3,PE=1,求AD的长.
(1)求证:AD=BE;
(2)设∠BPQ=α,那么α的大小是否随D、E的位置变化而变化?请说明理由;
(3)若PQ=3,PE=1,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/cbf56b36-8e2e-4ff6-9814-a1b27e2b148b.png?resizew=142)
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解答题-应用题
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【推荐2】如图,长方形
区域是一所学校,现打算沿直线
规划一条高铁路线
,已知
,
,若距离高铁轨道200米以内时,噪声会影响到学生的学习,以下是学校校长与施工人员的对话:
校长:您好,当前规划的高铁轨道离学校这么近,以后噪声会不会影响学生?
施工人员:不会的,学校A处离高铁轨道最近,
长达 220米,是达到设计要求的,您放心吧!
(2)若建设高铁轨道后,一列长度为 228 米的高铁以70 米/秒的速度通过时,学生是否会受到噪声影响?若受影响,求学生受到噪声影响的时间;若不受影响,请说明理由(结果保留整数,提示:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3faf171916f7a730fd124542294df9ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420c4faf8bddcb5c9bfad66a767d36a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab5c45a72849d2cae1d65b282b5bd19.png)
校长:您好,当前规划的高铁轨道离学校这么近,以后噪声会不会影响学生?
施工人员:不会的,学校A处离高铁轨道最近,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dd66ae037628e968c48622a8ceeb30.png)
(2)若建设高铁轨道后,一列长度为 228 米的高铁以70 米/秒的速度通过时,学生是否会受到噪声影响?若受影响,求学生受到噪声影响的时间;若不受影响,请说明理由(结果保留整数,提示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a929d0d84e3654f03694adc8d1a326e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d4843e10769b1b4a56c83866496500.png)
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【推荐1】阅读材料:
已知:如图1,
是直角三角形,
,
.求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/fd0e525d-af1a-4433-a5b8-df5a39673c9e.png?resizew=237)
证明:如图2,延长
至点
,使
,连接
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e294887ab065cedf03b77f49292bc6a9.png)
在
和
中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92116b5fe1d7ce624fab16cf513fd474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
(全等三角形的对应边相等).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
是等边三角形(有一个角等于
的等腰三角形是等边三角形).
【知识运用】(1)如图1,在Rt
中,
,
若
,
,则
______;
【类比证明】(2)如图3,请类比以上证明过程,证明:在
中,若
,
,求证:
;
【迁移创新】请你尝试解决以下问题.
(3)如图4,等边
中,延长
,
,使
,连接
,
.求证:
.
已知:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/fd0e525d-af1a-4433-a5b8-df5a39673c9e.png?resizew=237)
证明:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f8145e5b12aa0b0b13ce4d64c619ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e294887ab065cedf03b77f49292bc6a9.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92116b5fe1d7ce624fab16cf513fd474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfdae8fca29b6d2bb7ae5c35e84352b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
【知识运用】(1)如图1,在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
【类比证明】(2)如图3,请类比以上证明过程,证明:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
【迁移创新】请你尝试解决以下问题.
(3)如图4,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d831c9ba6d18774540e2aaa29132fec9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/ee1c2e10-42f6-47aa-ae01-55e01948d995.png?resizew=234)
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【推荐2】如图,
的半径为1,A、B、C是
上的三个点,点P在劣弧AB上,
,PC平分
.
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939720752807936/2940904853102592/STEM/cae00875-9ec1-42d0-b27d-0008bebfb112.png?resizew=155)
(1)求证:
;
(2)当点P位于什么位置时,
的面积最大?求出最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b3bfde4b7cbca10de7d63bb7b2cfd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/2022/3/19/2939720752807936/2940904853102592/STEM/cae00875-9ec1-42d0-b27d-0008bebfb112.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e7a8efca63928bf96889108577726a.png)
(2)当点P位于什么位置时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
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【推荐1】如图,在四边形
中,
,对角线
与
相交于点
,
、
分别是边
、
的中点.
;
(2)当
,
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.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/ac047e91852b91af639feec23a9598b2.png)
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(2)当
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解答题-证明题
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【推荐2】在Rt△ABC中,∠ABC=90°,BD为∠ABC的角平分线,F为AC的中点,AE∥BC交BD的延长线于点E,其中∠FBC=2∠FBD.
(1)求∠EDC的度数.
(2)求证:BF=AE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/dc5fc76e-7872-4c0c-9241-01cd208c7911.png?resizew=177)
(1)求∠EDC的度数.
(2)求证:BF=AE.
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