如图,AB是等腰直角三角形ABC的斜边,若点M在边AC上,点N在边BC上,沿直线MN将△MCN翻折,使点C落在边AB上,设其落点为P.
(1)求证:AM=PN;
(2)当点P是边AB的中点时,求证:
;
(3)当点P不是边AB的中点时,
是否仍然成立?请说明理由.
(1)求证:AM=PN;
(2)当点P是边AB的中点时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7732a55514cbb6615cee92ad5ac9dfac.png)
(3)当点P不是边AB的中点时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7732a55514cbb6615cee92ad5ac9dfac.png)
![](https://img.xkw.com/dksih/QBM/2021/3/12/2676320498114560/2677195808448512/STEM/42dfa720-c55c-4b99-848f-fe6c15eaa51c.png)
2021·安徽·一模 查看更多[4]
2021年安徽省志诚教育教育集团十校联盟中考数学一模卷 B(已下线)专题4.54 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)专题27.49 《相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)专题6.52 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)
更新时间:2021-03-13 21:11:43
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解答题-证明题
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【推荐1】如图,在四边形
中,
,
,点
在
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/845f3bd4-d015-42a9-b500-58197dd24e54.jpg?resizew=103)
(1)求证:
.
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.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/f135ae4531e59a3c5a7c1e475a5e8934.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/845f3bd4-d015-42a9-b500-58197dd24e54.jpg?resizew=103)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604a80b177865712cd42f48fa7c3a09d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】【教材呈现】如图是某版九年级上册数学教材的部分内容.如图1,先把一张矩形纸片ABCD上下对折后展开,折痕为MN;如图2,再把点B叠在折痕线上,得到
,过点B向右折纸片后展开,使D,Q,A三点仍保持在一条直线上,折痕为PQ.
(1)求证:
.
(2)你认为
和
相似吗?如果相似,给出证明;如果不相似,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865078561497088/2869509661802496/STEM/beb46028-5802-4fd6-b28b-c420e1d9613f.png?resizew=350)
【问题解决】
(1)写出教材中的第一问的证明过程.
(2)小明同学对教材中的第二问进行作答,下面只给出了部分证明过程,请你结合小明的思路填空,将证明过程补充完整.判断:
和
相似.证明:作
的斜边AB上的中线QF,如图3所示,则
.由题意得
,
.
为______.
______°,∵
,
______°,由翻折可知
=______°.∵
,
,∴
.∴
∠______.又∵
,∴
.
【结论应用】在图2的基础上,将纸片ABCD按图4所示翻折,点C恰好落在直线AB上,得到
.若
,则CG的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f4df3d8e0b0e018d66ab68272d179a.png)
(2)你认为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865078561497088/2869509661802496/STEM/beb46028-5802-4fd6-b28b-c420e1d9613f.png?resizew=350)
【问题解决】
(1)写出教材中的第一问的证明过程.
(2)小明同学对教材中的第二问进行作答,下面只给出了部分证明过程,请你结合小明的思路填空,将证明过程补充完整.判断:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3131ba6b7617e178db2d1a81b7feba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e33caded35c3a0d557997ca68e0a20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921572a179bb43b613d8e4297cac548f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/723b21b2691ddcae7c9d79dcf3c0825a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24406e7eb3a3dffdc193523439ffc98e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0663251570b0bc93227d083120fe40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb9ae0832224277fa8d42eccc0112b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1b21a9635b07a05f0f46d8c531337f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9eece319e5e1ccb1021287e2ca565b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b405a122ded2eb0395d5434892ae7b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37310624edf19e41d943715f97ffd34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f85ae236411e174f5fd37afc7584324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d45c24fa6f5b6767bda0202c3ee139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd17674c479370a7b8d40135239f20c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811bc6d24ab0030ff79318f0c68e8810.png)
【结论应用】在图2的基础上,将纸片ABCD按图4所示翻折,点C恰好落在直线AB上,得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaecf08a22124a457128fb04c9c02bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865078561497088/2869509661802496/STEM/25e5d3e8-6a0f-4a2f-80eb-e2c9599e94d4.png?resizew=340)
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【推荐1】如图,在
中,∠A=90°,AB=12cm,AC=6cm,点P沿AB边从点A开始向点B以每秒2cm的速度移动,点Q沿CA边从点C开始向点A以每秒1cm的速度移动,P、Q同时出发,用t表示移动的时间.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/fbca74cd-c5ed-4c43-8754-066f6163a633.png?resizew=189)
(1)当t为何值时,△QAP为等腰直角三角形?
(2)当t为何值时,以点Q、A、P为顶点的三角形与△ABC相似?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/14/fbca74cd-c5ed-4c43-8754-066f6163a633.png?resizew=189)
(1)当t为何值时,△QAP为等腰直角三角形?
(2)当t为何值时,以点Q、A、P为顶点的三角形与△ABC相似?
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【推荐2】如图,在
中,
,
,点
从点
开始沿
向点
以
的速度移动,点
从点
开始沿
向点
以
的速度移动,如果
,
分别从
,
同时出发,经过几秒
与
相似?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/b0259b34-a4e9-4e68-b768-fd5f999e41e2.png?resizew=138)
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