如图,四边形OABC是一张放在平面直角坐标系中的长方形纸片,O为原点,点A在x轴上,点C在y轴上,OA=10,OC=6.
(1)用直尺和圆规在AB上取一点M,使得△CBM沿CM翻折后,点B落在x轴的B′点上,求B′点的坐标;
(2)求折痕CM所在直线的表达式.
(1)用直尺和圆规在AB上取一点M,使得△CBM沿CM翻折后,点B落在x轴的B′点上,求B′点的坐标;
(2)求折痕CM所在直线的表达式.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/6d82838b-63a7-4d12-be11-8267dad3c1ec.png?resizew=155)
更新时间:2021-02-04 10:35:07
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【推荐1】如图,已知在平面直角坐标系中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d36cf4115062073e8a0468bae7e8a4.png)
(1)求
的面积.
(2)在
轴上是否存在一点
,使得
是从
为底的等腰三角形,若存在,求出
点坐标;若不存在,说明理由.
(3)有一个
,使得
,求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1375ed3dfe4a97e0c87e1adb0a282dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbedd8668277f5e33aa06e77960800a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d36cf4115062073e8a0468bae7e8a4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)有一个
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c6735de38404b772d0a0760d92bd4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3394bf99b36510637dcd6187a88c691f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/11/a8040998-233e-4cf8-b463-86a86eb8a7cf.png?resizew=498)
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【推荐2】如图,正比例函数y=
x与一次函数y=ax+7的图象相交于点P(4,n),过点A(2,0)作x轴的垂线,交一次函数的图象于点B,连接OB.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/68cf5b35-32de-450d-ad6b-5c770e8f05c0.png?resizew=163)
(1)求a值;
(2)求△OBP的面积;
(3)在坐标轴的正半轴上存在点Q,使△POQ是以OP为腰的等腰三角形,请直接写出Q点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/68cf5b35-32de-450d-ad6b-5c770e8f05c0.png?resizew=163)
(1)求a值;
(2)求△OBP的面积;
(3)在坐标轴的正半轴上存在点Q,使△POQ是以OP为腰的等腰三角形,请直接写出Q点的坐标.
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【推荐1】如图:长方形纸片ABCD中,AB=10cm,BC=8cm,E为BC上的一点.现将纸片沿AE翻折,使点B与CD边上的点F重合,求线段EF的长?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/3a946972-93fd-4079-87cb-e0838f698fe4.png?resizew=158)
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【推荐2】如图1,将
纸片沿中位线
折叠,使点
的对称点
落在
边上,再将纸片分别沿等腰
和等腰
的底边上的高线
,
折叠,折叠后的三个三角形拼合形成一个矩形,类似地,对多边形进行折叠,若翻折后的图形恰能拼成一个无缝隙、无重叠的矩形,这样的矩形称为叠合矩形.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/6fa50f98-26db-499b-b97b-26e95efd982e.png?resizew=453)
(1)将
纸片按图2的方式折叠成一个叠合矩形
,则操作形成的折痕分别是线段_____,_____;
______.
(2)
纸片还可以按图3的方式折叠成一个叠合矩形
,若
,
,求
的长.
(3)如图4,四边形
纸片满足
.小明把该纸片折叠,得到叠合正方形.请你帮助画出叠合正方形的示意图,并求出
的长.
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/ca860a7eb16f416a8b07e959af6d3bac.png?resizew=45)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/7ecea658ae0b4b3bb842ed5f440af8e0.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/8c1ad68c630d4349bad8a062c775d17b.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/9e61bf2fa7dc4e179ac40286b280bd2a.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/ee2ac77bc84b4c5a9d8f130aa4efd7bc.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/41421fdca8f648dfba48a5f09940905b.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/fd0fa9d188e84c0b99cab269978431cd.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/4193c86aed914db5877abf0941c368b9.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/fcae66e0986340a193e616af9b71c457.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/0d5c60ff-91ee-4d40-bdd1-c168ab50a435.png?resizew=190)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/6fa50f98-26db-499b-b97b-26e95efd982e.png?resizew=453)
(1)将
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/7834f0ea48394f68a943d0d8397ab1e4.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/8313c717f49e407e8b1dc59293d846c1.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/3ae41cc6c1724c0f987516ac85e1c73a.png?resizew=124)
(2)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/7834f0ea48394f68a943d0d8397ab1e4.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/28dccdda82a24d5880c2cefc0966d1bb.png?resizew=51)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/62ed61bccc864c44946454a68374fa79.png?resizew=49)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/ebf13a56da4a41f8829c245959551d85.png?resizew=59)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/dd430a557987436eaefd3945c8829872.png?resizew=28)
(3)如图4,四边形
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/b0003403e7b44aab82873f5091d87f86.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/2d124bf7cea240e596c84155d2c00fe1.png?resizew=304)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760386564096/1773760386949120/STEM/4cb0d81e85434a4aaf29afaa9196c549.png?resizew=56)
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【推荐1】如图1,在平面直角坐标系中,点
在
轴上,
,点
在
轴的负半轴,点
在
轴的正半轴,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606661954404352/2610191471443968/STEM/50a5b7be-5012-4123-80ee-37ab73353206.png)
(1)求点
的坐标;
(2)如图2,作点
关于直线
的对称点
,连接
,
,若点
以每秒3个单位的速度从点
运动到点
,同时点
以每秒4个单位的速度从点
延射线
运动,点
和点
一个运动停止,另一个也停止,连接
,
,设两点的运动时间为
,四边形
的面积为
,用
表示
,并直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33023099de23b750faf9776eabbcae17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ea7dda7ec9aee1e66fc6b2744163ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db02c2e276efce0199027d649110e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3854dc4272bad5c636f603ef0a6ffa84.png)
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606661954404352/2610191471443968/STEM/50a5b7be-5012-4123-80ee-37ab73353206.png)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)如图2,作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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/e3064b70f24e9bbcab76e0dc61274b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e641ef9b57dc83bf19b32a64686e16d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】如图1,在等腰Rt△ABC中,∠C=90°,O是AB的中点,AC=6,∠MON=90°,将∠MON绕点O旋转,OM、ON分别交边AC于点D,交边BC于点E(D、E不与A、B、C重合)
(1)判断△ODE的形状,并说明理由;
(2)在旋转过程中,四边形CDOE的面积是否发生变化?若不改变,直接写出这个值,若改变,请说明理由;
(3)如图2,DE的中点为G,CG的延长线交AB于F,请直接写出四边形CDFE的面积S的取值范围.
(1)判断△ODE的形状,并说明理由;
(2)在旋转过程中,四边形CDOE的面积是否发生变化?若不改变,直接写出这个值,若改变,请说明理由;
(3)如图2,DE的中点为G,CG的延长线交AB于F,请直接写出四边形CDFE的面积S的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/6/27eef789-725d-49c0-acb3-57b3a928d663.png?resizew=478)
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解题方法
【推荐3】倡导研究性学习方式,着力教材研究,习题研究,是学生跳出题海,提高学习能力和创新能力的有效途径.下面是一案例,请同学们认真阅读、研究,完成“类比猜想”及后面的问题.
习题解答:
习题 如图(1),点E、F分别在正方形
的边
、
上,
,连接
,则
,说明理由.
解答:∵正方形
中,
,
,
∴把
绕点A逆时针旋转
至
,点F、D、E′在一条直线上.
∴
,
又∵
,
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd600abfad5643139abd1e7b05aa27e.png)
∴
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/374fab2b-0949-402d-87f0-9d9509790646.png?resizew=123)
习题研究
观察分析:观察图(1),由解答可知,该题有用的条件是①
是四边形,点E、F分别在边
、
上;②
;③
;④
.
类比猜想:(1)在四边形
中,点E、F分别在
、
上,当
,
时,还有
吗?
研究一个问题,常从特例入手,请同学们研究:如图(2),在菱形
中,点E、F分别在
、
上,当
,
时,还有
吗?
(2)在四边形
中,点E、F分别在
、
上,当
,
,
时,
吗?
归纳概括:反思前面的解答,思考每个条件的作用,可以得到一个结论“
”的一般命题:在四边形
中,点E、F分别在
、
上,当
,
,
时,则
.
习题解答:
习题 如图(1),点E、F分别在正方形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
解答:∵正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be7094d76457fe1d278c8c615b1f9f3.png)
∴把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f3f4656a7cb49737734202bdcd460f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b0c9f828b57432a0662ce271ca9dff.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d48554d0b13e2aa8e898dae2d0d2f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/580e9251a7f21624f0ded01bcd74d040.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd600abfad5643139abd1e7b05aa27e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac6f03dbff06f9f0d9575f44a983971.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/374fab2b-0949-402d-87f0-9d9509790646.png?resizew=123)
习题研究
观察分析:观察图(1),由解答可知,该题有用的条件是①
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59281d3136f2c67c078d98842171224d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
类比猜想:(1)在四边形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
研究一个问题,常从特例入手,请同学们研究:如图(2),在菱形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
(2)在四边形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
归纳概括:反思前面的解答,思考每个条件的作用,可以得到一个结论“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9c71ed9ef8f6fcea1c6d6702177a4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1499aa4d87f51ff4f1fb6587c90b28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c9af98a1a048b1e2f7c71e83c33498c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/2fe8d315-1c16-4690-83a0-d3e5fb84edb1.png?resizew=244)
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