如图,在
中,
,在直线
上方作正方形
,将线段
绕点
逆时针旋转
至
,连接
,
.
(1)补全图形,求证:
;
(2)若
,求
的值;
(3)若
,当
取最小值时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/cbc9d74d-290a-447d-992f-8b54b1d5b1c1.png?resizew=135)
(1)补全图形,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bc0cc876a60c8cbdccc6a9a0b5b993.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1fe7660ee42b8d3a9c076b700ae59a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899f4daf6f7a4d61c16c0f5214461dee.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
更新时间:2023-10-13 22:16:24
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】已知:如图,
中,点D是BC的中点,
于点E.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2962768487997440/2986324194025472/STEM/c50482b4-d70f-4eff-86ce-1e78d64b30c2.png?resizew=148)
(1)求作:射线DF,使
于点F(要求:尺规作图,保留作图痕迹,不写作法;如果完成有困难,可画出草图后解答(2)题);
(2)在(1)得到的图中,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2962768487997440/2986324194025472/STEM/c50482b4-d70f-4eff-86ce-1e78d64b30c2.png?resizew=148)
(1)求作:射线DF,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
(2)在(1)得到的图中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
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【推荐2】如图,在
中,
,
、
、
分别是
、
、
的中点,连结
、
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/724ddade-0636-4d5d-8699-1d35b6a6587c.png?resizew=244)
请你结合上述讨论,选择恰当的方法完成证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f718e34f5af556bd4a0994ad5a80ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/724ddade-0636-4d5d-8699-1d35b6a6587c.png?resizew=244)
针对这道题,三位同学进行了如下讨论-- 小胡:“需要利用全等证明.” 小吴:“要证中线相等,我想到了直角三角形.” 小明:“我觉得你们都对,但还有别的方法.” |
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【推荐3】从反思中总结基本活动经验是一个重要的学习方法.例如,我们在全等学习中所总结的“一线三等角、K型全等”这一基本图形,可以使得我们在观察新问题的时候很迅速地联想,从而借助已有经验,迅速解决问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/e08d1ac3-f6df-4a5a-ad44-8b1fb96a8523.png?resizew=526)
(1)如图1,在平面直角坐标系中,四边形
是正方形,且
,点E是线段
延长线上一点,M是线段
上一动点(不包括点O、B),作
,垂足为M,且
.设
,请你利用基本活动经验直接写出点N的坐标 (用含a的代数式表示);
(2)基本经验有利有弊,当基本经验有利于新问题解决的时候,这是基本经验的正迁移;当基本经验所形成的思维定势局限了新问题的思考,让新问题解决不出来的时候,这是基本经验的负迁移.例如,如果(1)的条件去掉“且
”,加上“交
的平分线于点N”,如图2,求证:
.如何突破这种定势,获得问题的解决,请你写出你的证明过程.
(3)如图3,请你继续探索:连接
交
于点F,连接
,下列两个结论:①
的长度不变;②
平分
,请你指出正确的结论,并给出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/e08d1ac3-f6df-4a5a-ad44-8b1fb96a8523.png?resizew=526)
(1)如图1,在平面直角坐标系中,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab158dd9e96abcae0f115f54fa66c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b437423e59ede2bf276c33d0fd644f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a9be2f8ba5170eaf0bc4604e021706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bba25a314fb799efba2895cb1f1f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d93f2968ff78d56d7c71bc7bd33101a.png)
(2)基本经验有利有弊,当基本经验有利于新问题解决的时候,这是基本经验的正迁移;当基本经验所形成的思维定势局限了新问题的思考,让新问题解决不出来的时候,这是基本经验的负迁移.例如,如果(1)的条件去掉“且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bba25a314fb799efba2895cb1f1f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b920f015c63f066a8ae00e3066b50e20.png)
(3)如图3,请你继续探索:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7032cd1fe3619ae86ef81b1c4363b1d3.png)
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【推荐1】 如图,菱形
的对角线
、
相交于点
,过点
作
且
,连接
、
,连接
交
于点
.
(1)求证:
;
(2)若菱形
的边长为
,
,求
的长.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aef7a4eac6fdf193c0ed4d8753f64637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
(2)若菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/14/5f006305-6387-40a0-b0e4-ced9e53c871c.png?resizew=166)
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【推荐2】如图,在四边形
中,
,
,对角线
,
交于点
,
平分
,过点
作
交
的延长线于点
,连接
.
是菱形;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30f6595dd643813b11ad71df61a10dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bc235df1d3cf1b65050cd1907590cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-问答题
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【推荐1】在平面直角坐标系
中,若直线与
轴夹角为
时,则称该直线为
轴的“相关直线”.已知点
、
的坐标分别为
,
.
轴的“相关直线”
过点
,则
______.
(2)如图,以
为边作正方形
,使
,
位于第二象限.若
轴的“相关直线”
平分正方形
的面积,求
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33736169c249a029f478a605dc2c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec0bc3a43265b63b6964476ca327fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
(2)如图,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】如图,点
是正方形
内一点,将
绕点
顺时针旋转
到
的位置,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca7ab29525ef5219386efdba0f8cc57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d283b10eec57c1559f6ddde0c3d52eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c920307646d6f9f78a72d5db52ac6809.png)
![](https://img.xkw.com/dksih/QBM/2019/6/10/2222632458551296/2223365343584256/STEM/ec90197753bd46a2b98cb4e52ce0ca54.png?resizew=98)
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解答题-证明题
|
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【推荐1】如图1,△ABC和△ADE均为等腰直角三角形,∠ACB=∠AED=90°,直线BD和直线CE交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/74b2cf9b-4925-456c-9a95-6989b7958e3c.png?resizew=315)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/95ce35d0-0dc1-4806-8cf6-d10ce400bb1a.png?resizew=238)
(1)线段BD与CE具有怎样的数量关系?写出证明过程;
(2)若AC=BC=3,AE=DE=
,将△ADE绕着点A在平面内旋转,当点D落在线段AC上时,在图2中补全图形,并求CF的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/74b2cf9b-4925-456c-9a95-6989b7958e3c.png?resizew=315)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/95ce35d0-0dc1-4806-8cf6-d10ce400bb1a.png?resizew=238)
(1)线段BD与CE具有怎样的数量关系?写出证明过程;
(2)若AC=BC=3,AE=DE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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解答题-问答题
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(0.65)
【推荐2】在正方形
中,点E在射线
上(不与点B、C重合),连接
,
,将
绕点E逆时针旋转
得到
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20787dee-0f85-408e-8a55-4aef9fa16eba.png?resizew=249)
(1)如图1,点E在
边上.
①依题意补全图1;
②若
,
求
的长;
(2)如图2,点E在
边的延长线上,用等式表示线段
,
,
之间的数量关系.
![](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/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20787dee-0f85-408e-8a55-4aef9fa16eba.png?resizew=249)
(1)如图1,点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①依题意补全图1;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc95a7d8996ebdf0494061098bd1b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104051d43ef4e63c03f624ef249631ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)如图2,点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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