如图,设四边形
是边长为1的正方形,以正方形
的对角线
为边作第二个正方形
,再以第二个正方形的对角线
为边作第三个正方形
,如此下去…
(1)记正方形
的边长为
,依上述方法所作的正方形的边长依次为
,
,求出
的值.
(2)根据以上规律写出第n个正方形的边长
的表达式.并求出
的值.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344164942bd5946e83cbdf1ceb98c676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/0a685b00-4a0d-4cbc-b159-e90e66a4c56c.png?resizew=205)
(1)记正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85657c19197a20a41d4c1d5f17ca3a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d7171905c935da184ff5c7697bc8dd.png)
(2)根据以上规律写出第n个正方形的边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaec3004937aab88c44e66753caab782.png)
更新时间:2023-07-30 11:56:39
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解答题-作图题
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【推荐1】如图.在平面直角坐标系中,A(1,4),B(5,0),C(2,1)
(1)判断△ABC的形状.
(2)请画出△ABC关于x轴对称的△A1B1C1;
(3)请写出A1的坐标:A1 ;C1 .
(4)△A1B1C1的面积为 ;
(5)在y轴上画出点P,使PA+PC最小.(保留作图痕迹)
(1)判断△ABC的形状.
(2)请画出△ABC关于x轴对称的△A1B1C1;
(3)请写出A1的坐标:A1 ;C1 .
(4)△A1B1C1的面积为 ;
(5)在y轴上画出点P,使PA+PC最小.(保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2021/3/23/2684020659683328/2684640315875328/STEM/dde6ca6c965e4375a43b0da9a6bddc21.png?resizew=241)
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名校
【推荐2】一个数值转换器,如图所示:
(2)若输入有效的x值后,始终输不出y值,请写出所有满足要求的x的值;
(3)若输出的y是
,请写出两个满足要求的x值.
(2)若输入有效的x值后,始终输不出y值,请写出所有满足要求的x的值;
(3)若输出的y是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐3】【发现问题】
在学习第六章《实数》数学活动时,同学们进行了“动手制作正方体纸盒”的活动.活动方案如下:首先根据正方体的表面积求出棱长;其次在纸上画出与棱长相等的线段;最后制作出这个正方体.爱思考的小强发现正方体的棱长会随着它的表面积变化而变化;棱长有时会是无理数.
【提出问题】
正方体的棱长与它的表面积之间有怎样的数量关系?
棱长是无理数时,不能用刻度尺直接表示,该如何画出与棱长相等的线段呢?
【分析问题】
小强经历了以下一系列的计算和实际操作,并通过由数到形、由特殊到一般的方法探究了这两个问题.请你完成下面的探究:
(1)①当正方体的表面积是:
时,它的棱长是
;
②当正方体的表面积是
时,它的棱长是
;
③当正方体的表面积是
时,它的棱长是
.(用含
的式子表示)
(2)小强设计了以下的方案,得到边长为无理数的线段.
将正方形
和正方形
如下图摆放,其中
,
,
共线,在边
上截取
,把
和
分别旋转到
和
,此时
,
,
,
共线,连接
,
,得到新正方形
.根据新正方形
的面积,通过开平方得到边长为无理数的线段.
①如图1,当
,
时,新正方形
的面积是
;
②如图2,当
,
时,新正方形
的面积是
;
③当正方形
和正方形
的面积同时扩大
倍(
为正整数),则新正方形
的边长扩大 倍.(用含
的式子表示)
(3)小丽想用一块面积为
的长方形纸片,沿着边的方向裁出两个相邻的正方形纸片,如图3,再经历(2)的剪拼操作得到新正方形
的面积为
.已知长方形纸片的长宽之比为
,裁出两个相邻的正方形纸片边长比为
.请你通过计算判断小丽能用这块长方形纸片裁出并剪拼得到符合要求的纸片吗?(
)
在学习第六章《实数》数学活动时,同学们进行了“动手制作正方体纸盒”的活动.活动方案如下:首先根据正方体的表面积求出棱长;其次在纸上画出与棱长相等的线段;最后制作出这个正方体.爱思考的小强发现正方体的棱长会随着它的表面积变化而变化;棱长有时会是无理数.
【提出问题】
正方体的棱长与它的表面积之间有怎样的数量关系?
棱长是无理数时,不能用刻度尺直接表示,该如何画出与棱长相等的线段呢?
【分析问题】
小强经历了以下一系列的计算和实际操作,并通过由数到形、由特殊到一般的方法探究了这两个问题.请你完成下面的探究:
(1)①当正方体的表面积是:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a262cc399be43ab9f4b36afa8b6cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250e270944a1a50282c3c587ebad9d0c.png)
②当正方体的表面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3ba0d3bb61461d8481eca1cf2f5bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250e270944a1a50282c3c587ebad9d0c.png)
③当正方体的表面积是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f4d482d0aee118e23cdb927748c18fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250e270944a1a50282c3c587ebad9d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(2)小强设计了以下的方案,得到边长为无理数的线段.
将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f689d739f292d327e49ba94e8d7cf32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/370abdf35cb8817d35b78eea892731ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b676046204adeba41cd6d18824988eb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15916cbd3e84ee62b2c1ecf19c650b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d79d2ac93c9498c9c3ba22e2f987d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d955d197e2ecbfe724570663efcf2a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30763292d840c0cd6413f66b76e98ab3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1d1a0a484504c6dbd867e2c4b6d8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6ac50123b65107a0d534a7d59ccdaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09711c382aad0341699a14c45a74090d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829047552d880c8fe5649217c74b5e17.png)
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971da243eede611afc1def1d7dc1dfbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09711c382aad0341699a14c45a74090d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829047552d880c8fe5649217c74b5e17.png)
③当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)小丽想用一块面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/081085e0342a8d080d60808cddb781e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b309451c9587869b226674bcd16ffea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d7323a6d4eecc57a5871227da0daf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0217235a57aebe61c7b16ca81096c21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526ddee4ed97b917d9e4cc4542c72a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52881be613aa404e553da30d8987cfad.png)
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解答题-问答题
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【推荐1】观察图,先填空,然后回答问题.
(1)由上而下第8行,白球有______ 个,黑球有______ 个
(2)若第n行白球与黑球的总数记作y,则y与n的关系式为______ .
(3)请你求出第2016行白球和黑球的总数.
(1)由上而下第8行,白球有______ 个,黑球有______ 个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
(2)若第n行白球与黑球的总数记作y,则y与n的关系式为______ .
(3)请你求出第2016行白球和黑球的总数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/8b6178d6-984b-40a8-a13d-c481cebe28db.png?resizew=248)
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解答题-计算题
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【推荐2】(1)为了计算1+2+3+…+8的值,我们构造图形(图1),共8行,每行依次比上一行多一个点.此图形共有(1+2+3+…+8)个点.如图2,添出图形的另一半,此时共8行9列,有8×9=72个点,由此可得1+2+3+…+8=
×72=36.
用此方法,可求得1+2+3+…+20= (直接写结果).
(2)观查下面的点阵图(如图3),解答问题:
填空:①1+3+5+…+49= ;
②1+3+5…+(2n+1)= .
(3)请构造一图形,求
(画出示意图,写出计算结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
用此方法,可求得1+2+3+…+20= (直接写结果).
(2)观查下面的点阵图(如图3),解答问题:
填空:①1+3+5+…+49= ;
②1+3+5…+(2n+1)= .
(3)请构造一图形,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6248f0b4e19814b3c9aebcea1f4bf2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/abc01fae-f3e9-4def-9ff5-5b44a60ef29e.png?resizew=664)
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解答题-证明题
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【推荐1】如图,在矩形
中,过对角线
的中点O作
的垂线
,分别交
、
于点E,F.
;
(2)若
,
,连接
,
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e87371ec58bf581b1a41d63af89aa8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
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解答题-问答题
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【推荐2】如图,已知直线
与x轴、y轴分别相交于A,B两点,与反比例函数
在第二象限内交于点C,且点B是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/6/19/2488192768081920/2488533189910528/STEM/68372a05f1344eb392d993a56ec794c9.png?resizew=118)
(1)求点C的坐标及k的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec89d17a1b8f7961e2f1f27c2d50685.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2020/6/19/2488192768081920/2488533189910528/STEM/68372a05f1344eb392d993a56ec794c9.png?resizew=118)
(1)求点C的坐标及k的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84398c8a4d89abf190d7e2ef9ae82571.png)
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真题
【推荐3】鄂州市莲花山是国家
级风景区,元明塔造型独特,是莲花山风景区的核心景点,深受全国各地旅游爱好者的青睐.今年端午节,景区将举行大型包粽子等节日庆祝活动.如图2,景区工作人员小明准备从元明塔的点G处挂一条大型竖直条幅到点E处,挂好后,小明进行实地测量,从元明塔底部F点沿水平方向步行30米到达自动扶梯底端A点,在A点用仪器测得条幅下端E的仰角为
;接着他沿自动扶梯
到达扶梯顶端D点,测得点A和点D的水平距离为15米,且
;然后他从D点又沿水平方向行走了45米到达C点,在C点测得条幅上端G的仰角为
.(图上各点均在同一个平面内,且G,C,B共线,F,A,B共线,G、E、F共线,
,
).
(1)求自动扶梯
的长度;
(2)求大型条幅
的长度.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e84109d02f63ef211885f899d99dd52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a8f68d0e92428e1bec7e94d9188a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16aad38b43462ca7a8fb9bc9484ad3a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48086d2d0cd40f268d1574b3b9696361.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/a64fd8ea-00bc-4331-aa10-a661d4ec3ea9.png?resizew=148)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/30/d9169e2d-670d-44bc-8819-8f3c69428058.png?resizew=203)
(1)求自动扶梯
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求大型条幅
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】在平面直角坐标系
中,对于点
,如果点
满足条件:以线段
为对角线的正方形,且正方形的边分别与
轴,
轴平行,那么称点
为点
的“和谐点”,如下图所示.
已知点
,
,
.
)已知点
的坐标是
.
①在
,
,
中,是点
的“和谐点”的是__________.
②已知点
的坐标为
,如果点
为点
的“和谐点”,求
的值;
(
)已知点
,如果线段
上存在一个点
,使得点
是点
的“和谐点”,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4266e55d88908b64f3d90a9ae7abf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f4f980d0129368dc720886636e1f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/116458f555d2efd27bfc838fe19264d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80991c1f0c963104740e50cfff6f29a8.png)
①在
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
②已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db95e996d9fac364f3a30bcffe559781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a56dd9a35c06b3ee334e83602fefc82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-证明题
|
适中
(0.65)
真题
【推荐2】如图,在等腰Rt△ABC中,∠C=90°,正方形DEFG的顶点D地边AC上,点E、F在边AB上,点G在边BC上.
![](https://img.xkw.com/dksih/QBM/2013/9/12/1573682784567296/1573682790653952/STEM/b8e6ec0aae8f4fc3b22fbe2f98558f3d.png)
(1)求证:△ADE≌△BGF;
(2)若正方形DEFG的面积为16cm
,求AC的长.
![](https://img.xkw.com/dksih/QBM/2013/9/12/1573682784567296/1573682790653952/STEM/b8e6ec0aae8f4fc3b22fbe2f98558f3d.png)
(1)求证:△ADE≌△BGF;
(2)若正方形DEFG的面积为16cm
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
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