在
中,
,
,点E在
内部,以
为斜边作等腰直角三角形
,使得点D,E在AC的异侧,连接
交
于点M,点G在
上,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/86143770-9329-4b86-a21a-88fcb897f621.png?resizew=475)
(1)如图1,求证:
;
(2)当点E是
的中点时,连接
,如图2,求
的值;
(3)连接
,延长
交
于点F,如图3,求证:点F是
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.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/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef97c3a13ed12e184a5f488223213029.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/86143770-9329-4b86-a21a-88fcb897f621.png?resizew=475)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7915e29e35e279496da7590154133c17.png)
(2)当点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab77ae34b07ec7dd705196bfea68344f.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
更新时间:2024-03-23 10:45:25
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相似题推荐
解答题-问答题
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【推荐1】如图1,在
中,
,
于点O,
,
,在
的外部以AB为边作等边
,点E是线段AO所在直线上一动点(点E不与点A重合),将线段BE绕点B顺时针方向旋转60°得到线段BF,连接EF.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/69ae0e5f-3b58-43d2-a9f5-6677b4ec1aaf.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/ee74b541-5636-4ded-8aed-4ca27525802d.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/29886cf8-1cff-4a8e-8c42-0ad15b69013d.png?resizew=203)
(1)求AO的长;
(2)如图2,当点E在线段AO上,且点F,E,C三点在同一条直线上时,求BF的长;
(3)连接DF,若
的面积为3,请直接写出BF的长.
![](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/88bb2d945b7908ebac080e6595d4895f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/69ae0e5f-3b58-43d2-a9f5-6677b4ec1aaf.png?resizew=211)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/ee74b541-5636-4ded-8aed-4ca27525802d.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2974151783219200/2977936752574464/STEM/29886cf8-1cff-4a8e-8c42-0ad15b69013d.png?resizew=203)
(1)求AO的长;
(2)如图2,当点E在线段AO上,且点F,E,C三点在同一条直线上时,求BF的长;
(3)连接DF,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
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【推荐2】如图1,Rt△ABC中,∠ABC=90°,BC<AB<2BC.在AB边上取一点M,使AM=BC,过点A作AE⊥AB且AE=BM,连接EC,再过点A作AN∥EC,交直线CM、CB于点F、N.
(1)证明:∠AFM=45°;
(2)若将题中的条件“BC<AB<2BC”改为“AB>2BC”,其他条件不变,请你在图2的位置上画出图形,(1)中的结论是否仍然成立?如果成立,请说明理由;如果不成立,请猜想∠AFM的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927362226372608/1928113932935168/STEM/732f9d3ee30f4628a339dc60052f6f4c.png?resizew=156)
(1)证明:∠AFM=45°;
(2)若将题中的条件“BC<AB<2BC”改为“AB>2BC”,其他条件不变,请你在图2的位置上画出图形,(1)中的结论是否仍然成立?如果成立,请说明理由;如果不成立,请猜想∠AFM的度数,并说明理由.
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927362226372608/1928113932935168/STEM/732f9d3ee30f4628a339dc60052f6f4c.png?resizew=156)
![](https://img.xkw.com/dksih/QBM/2018/4/19/1927362226372608/1928113932935168/STEM/5f0c88f352b2448fab3f69311e64003c.png?resizew=171)
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【推荐1】问题提出:
(1)我国古代数学家赵爽巧妙地用“弦图”证明了勾股定理,标志着中国古代的数学成就.小林用边长为10的正方形
制作了一个“弦图”:如图①,在正方形
内取一点E,使得
,作
,
,垂足分别为F、G,延长
交
于点H.若
,求
;
问题解决:
(2)如图②,四边形
是公园中一块空地,
米,
,
,
,空地中有一段半径为50米的弧形道路(即
),现准备在
上找一点P,将弧形道路改造为三条直路(即
),并要求
,三条直路将空地分割为
、
和四边形
三个区域,用来种植不同的花草.
①求
的度数;
②求四边形
的面积.
(1)我国古代数学家赵爽巧妙地用“弦图”证明了勾股定理,标志着中国古代的数学成就.小林用边长为10的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f46f19939f38833f9152942f8241b7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1893d78af450a5fa09810537adc2dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37a450636672d5a6b202d42aa3a1f51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8431e94821612587f5bda0e4b7b4e4a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c49e2601b13579e9630c63e2bec2215.png)
问题解决:
(2)如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bc8261605ac71fbec7a9558e5a9791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c7267e5313b9b00ef22c94a479fc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9b0d3cf342e065b4c8e21443bfbfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bdc60a42a1addaf772c18972e576fa.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
②求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bdc60a42a1addaf772c18972e576fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/d25f6cf5-71b7-46ee-8366-e6a6d4973a0b.png?resizew=370)
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【推荐2】我们在解决问题的时候,常通过全等变换将分散的边或角等条件相对集中在一起,构建起新的联系,从而解决问题.通过类比联想,引申拓展研究典型题目,可达到解一题知一类的目的.
分别是正方形
的边
上的点,连接
,若
,则线段
之间数量是 ;
(2)【类比探究】如图2,
为正方形
内一点,
,求
的度数;
(3)【拓展延伸】如图3,在四边形
中
,
,
.试探究
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905be63854b77685f08165d5e2c16696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e75ea3200ee1889daaa6527f9d2d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26526faf0e64ce31688026630b502427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b0e6c810bb1c023c0a9b22cc25e113.png)
(2)【类比探究】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb3216a6f9c5a5dfc1b283fbc458eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)【拓展延伸】如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fd3cafe73dc8d3c7ed91559502d539e.png)
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【推荐1】如图1,
和
都是等腰直角三角形,
,
,且点
是
上的点(点
不与点
,
重合),过点
作
交
的延长线于点
,
的延长线交
于点
.过点
作
交
于点
,连接
.
(1)求证:
;
(2)若
,求
的长;
(3)如图2,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d831c9ba6d18774540e2aaa29132fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71db0a14246c9e509f0d7397ff4dd74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91686de6945575230a817f6f9c6042cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d59c75ef1c671eee1d45d17d1e6488f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69f1b840bd47cf54155a4476f58df5da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8bcd2d9aac3da2c6841ea7bb6e42cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8b13a3e3d7ff2eb7cf21454a7e99fb.png)
![](https://img.xkw.com/dksih/QBM/2021/9/25/2815769839222784/2815899936243712/STEM/34a2f56f-1390-406f-b33a-ea0ed75e5f9a.png)
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解题方法
【推荐2】如图,在Rt△ABC中,∠ACB=90°,∠B=30°,点M是AB的中点,连接MC,点P是线段BC延长线上一点,且PC<BC,连接MP交AC于点H.将射线MP绕点M逆时针旋转60°交线段CA的延长线于点D.
(1)找出与∠AMP相等的角,并说明理由.
(2)若CP=
BC,求
的值.
(1)找出与∠AMP相等的角,并说明理由.
(2)若CP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606ff826406d9fc8403d365762cd9e4c.png)
![](https://img.xkw.com/dksih/QBM/2021/8/5/2779510033203200/2781966565343232/STEM/0af0c4e3-7e13-4bc7-8c29-85c4a471715d.png)
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【推荐1】如图,在平面直角坐标系中,二次函数
的图像与x轴交于点A和点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/b7aee63a-69cf-406e-a35a-50f094abfbaa.png?resizew=310)
(1)求二次函数的表达式;
(2)若点P是抛物线上一点,满足
,求点P的坐标;
(3)若点Q在第四象限内,且
,点M在y轴正半轴,
,线段
是否存在最大值,如果存在,直接写出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c47e58943e0c6bb4dc2c0b34e10532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1871fad5b818837f699fc07638deae14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/b7aee63a-69cf-406e-a35a-50f094abfbaa.png?resizew=310)
(1)求二次函数的表达式;
(2)若点P是抛物线上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9177357c4268d8d0600825bf54c5edc2.png)
(3)若点Q在第四象限内,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e5590b4823492206a78f7b48d61f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbea2e4a58019ac04348b368c1b28d64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
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(0.4)
【推荐2】如图,直线AB:y=
x+2与x轴、y轴分别交于A,B两点,C是第一象限内直线AB上一点,过点C作CD⊥x轴于点D,且CD的长为
,P是x轴上的动点,N是直线AB上的动点.
(1)直接写出A,B两点的坐标;
(2)如图①,若点M的坐标为(0,
),是否存在这样的P点.使以O,P,M,N为顶点的四边形是平行四边形?若有在,请求出P点坐标;若不存在,请说明理由.
(3)如图②,将直线AB绕点C逆时针旋转交y轴于点F,交x轴于点E,若旋转角即∠ACE=45°,求△BFC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec85f29c0860b57a8f0cf8098c13a97e.png)
(1)直接写出A,B两点的坐标;
(2)如图①,若点M的坐标为(0,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09316b16d0479a2a81d1a2c6bf6e75f4.png)
(3)如图②,将直线AB绕点C逆时针旋转交y轴于点F,交x轴于点E,若旋转角即∠ACE=45°,求△BFC的面积.
![](https://img.xkw.com/dksih/QBM/2019/6/24/2232757821087744/2233387653578752/STEM/5d9a8bf097f34c0ea3537fb92e1b53b8.png?resizew=405)
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