我们知道:如图①,点
把线段
分成两部分,如果
,那么称点
为线段
的黄金分割点.它们的比值为
.
(1)在图①中,若
,则
的长为______
;
(2)如图②,用边长为
的正方形纸片进行如下操作:对折正方形
得折痕
,连接
,将
折叠到
上,点
对应点
,得折痕
,
.试说明:
是
的黄金分割点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90cece4fd39f9413d3b3f8dd98381a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
(1)在图①中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb576e265a47dc3ac83b2c8052ba7a23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97153bc3d02dfb38ee046487a8037a41.png)
(2)如图②,用边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0731be9fc9a06a97db4857ccd2240772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635033247842304/2681831287234560/STEM/c4305e5429344e9bbd3d0b92a3d905ed.png?resizew=296)
更新时间:2021-03-20 10:22:37
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】【感知】如图①,在
中,点
为
的中点,连接
并延长交
的延长线于点
.求证:点
是
的中点,点
是
的中点;
【应用】如图②,在四边形
中,
,点
是
的中点,
,
的延长线相交于点
,则
_______;
【拓展】如图③,在
中,点
是
的中点,点
是
上一点,
,
、
相交于点
,则
_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
【应用】如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf13b3ca8672525226be278447b12a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5200c8f96a3dead3244de2601c2f02eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
【拓展】如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/10cf607ab2cdc9487fd10f0b7c3c4a24.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aec0e7a3a344586012ee7d7826322a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/fe7c3622-7269-4209-abed-f4ef4086cac5.png?resizew=472)
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【推荐2】如图1,在平面直角坐标系中,
轴于
轴于
,连接
.
______,
______,
______;
(2)如图2折叠
,使点
与点
重合,折痕
交
于
,交
于
.
①求点
的坐标;
②在
轴上,是否存在点
,使得
为等腰三角形?若存在,请求出符合条件的所有点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e92a9426379deb968e82fc9bc8f9cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ac35a6661eac69a41067e3e3ea88d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)如图2折叠
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96645a3530e72d5d733d2c72147d340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】【特例感知】如图1,在正方形ABCD中,点E、F分别为AB,AD的中点,CF交于点G.
(1)易证
,可知DE、CF的关系为______________;(直接填写结果)
(2)连接BG,若
,求BG的长.
【初步探究】如图2,在正方形ABCD中,点E为AB边上一点,
分别交AD、BC于F、G,垂足为O,求证:
.
【基本应用】如图3,将边长为6的正方形ABCD折叠,使得点A落在边CD的中点M处,折痕为PQ,点P、Q分别在边AD、BC上,求PQ的长.
(1)易证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0873d609fc773d037d78ec4551e08da4.png)
(2)连接BG,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
【初步探究】如图2,在正方形ABCD中,点E为AB边上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662ecc67db7277595a0b53d8e218f799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bbc9286d44b05d523aaf998183b043.png)
【基本应用】如图3,将边长为6的正方形ABCD折叠,使得点A落在边CD的中点M处,折痕为PQ,点P、Q分别在边AD、BC上,求PQ的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/bac0bdc3-0556-4024-97e5-215f25ac92c7.png?resizew=419)
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【推荐2】如图,在正方形
中,E是
边上一点(不与B、C重合),将正方形
沿
折叠,使点B落在点F处,延长
交
于点G,连接
.
;
(2)若
.
①求
的周长:
②若点E是
的中点,
是
的平分线,求
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba5ff3249d4a5f717ad490bd08b4611.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f3197779e26c71a1b633b279613969.png)
②若点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b0b831b56c1a03925d0f5a332d8ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
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【推荐3】探究:如图①点E
、F分别在正方形ABCD的边BC、CD上,连结AE、AF、EF,将△ABE、△ADF分别沿AE、AF折叠,折叠后的图形恰好能拼成与△AEF完全重合的三角形.若BE=2,DF=3,求AB的长;
拓展:如图②点E、F分别在四边形BACD的
边BC、CD上,且∠B=∠D=90°.连结AE、AF、EF将△ABE、△ADF分别沿AE、AF折叠,折叠后的图形恰好能拼成与△AEF完全重合的三角形.若∠EAF=30°,AB=4,则△ECF的周长是 .
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/85e30d985b574f37ac8feaee08c9152e.png?resizew=3)
拓展:如图②点E、F分别在四边形BACD的
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/9abdb8b67b72471ca1e06bb830c79afa.png?resizew=3)
![](https://img.xkw.com/dksih/QBM/2019/7/10/2243851291901952/2244732415918080/STEM/836b51cf32104e2bb70de33e34b3c22e.png?resizew=315)
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名校
【推荐1】如图1,
中,
,
为
上的一点,以
为直径的
交
于
,连接
交
于
,交
于
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2021/2/23/2664274465611776/2671412904419328/STEM/bf5eeeb9af984d39a35a212c472861d1.png?resizew=554)
(1)求证:
与
相切;
(2)如图2,若
,
①若
,求线段
的长;
②求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ff9d4fdd0d176042505b7aac016852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9fcc3b010fd1f911c957e0c292bf49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a44be92f38e063a01b8cd67418815cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03fcb360984721a5600d426949ccdb14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147b52c4898098e88502f127fee41608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a44be92f38e063a01b8cd67418815cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c783bab7586f60dc14d4f10b6d5b12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391c0e2fc44598610d519dacb778062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cbe3d509ed0c87eee5034fd2160a88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4d919daaa9ed64528f6d2c3f3f334d.png)
![](https://img.xkw.com/dksih/QBM/2021/2/23/2664274465611776/2671412904419328/STEM/bf5eeeb9af984d39a35a212c472861d1.png?resizew=554)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d25313067f3e11f68da496344c4956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fa9709a70b3d99118b4b671fb016f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ca70055e5fcd525ce7c615837c7f68.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495be6a6b940e8affe38f2bcdee246b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08210f00bcdff12ee50579ce3c6f070d.png)
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【推荐2】如图,在矩形ABCD中,点G在边BC上(不与点B、C重合),连接AG,作DF⊥AG于点F,BE⊥AG于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/316c76cb-b894-431f-b0a1-68a05089c854.png?resizew=136)
(1)若AG=AD,求证:AB=DF;
(2)设
=k,连接BF、DE,设∠EDF=α,∠EBF=β,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/316c76cb-b894-431f-b0a1-68a05089c854.png?resizew=136)
(1)若AG=AD,求证:AB=DF;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c46496c760e808d219459f55ca511d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446052442efae54a63e7e94699a67f78.png)
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【推荐1】如图,△ABC中,AB=AC,∠A=36°,BD平分∠ABC.求证:
.
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195003121664/1574195008684032/STEM/4c190a08714940fd82c01be18f553b47.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195003121664/1574195008684032/STEM/e025157ed89b4924b84b3edc2804fafd.png)
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【推荐2】如图,是一张矩形纸片,其中
,
,怎样折叠这张纸片,才能找到
边上的黄金分割.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
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