如图,已知抛物线
与
轴交于
和
两点,与
轴交于
点.
(1)求此抛物线的解析式;
(2)设
是线段
上的动点,作
交
于
,连接
,当
的面积是
面积的2倍时,求
点的坐标;
(3)若
为抛物线上
、
两点间的一个动点,过
作
轴的平行线,交
于
,当
点运动到什么位置时,线段
的值最大,并求此时
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c468dc5cc34c14a188493a21019e8f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求此抛物线的解析式;
(2)设
![](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/68dfd32a77c3615069ad1e7eb5b226a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/4/9/2443620196753408/2444851738107904/STEM/c9bb7ba5eee149eda3c20d7ab321a6e8.png?resizew=129)
更新时间:2020-04-19 14:46:30
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相似题推荐
解答题-问答题
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困难
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【推荐1】当直线y=kx+b(k、b为常数且k≠0)与抛物线y=ax2+bx+c(a、b、c为常数,且a≠0)有唯一公共点时,叫做直线与抛物线相切,直线叫做抛物线的切线,这个公共点叫做切点,其切点坐标(x,y)为相应方程组
的解.如将直线y=4x与抛物线y=x2+4,联合得方程组
,从而得到方程x2+4=4x,解得x1=x2=2,故相应方程组的解为
,所以,直线y=4x与抛物线y=x2+4相切,其切点坐标为(2,8).
![](https://img.xkw.com/dksih/QBM/2022/4/17/2960143753560064/2962055972110336/STEM/3053c89a-bffa-4cd5-ba3b-04ea928130c2.png?resizew=232)
(1)直线m:y=2x﹣1与抛物线y=x2相切吗?如相切,请求出切点坐标;
(2)在(1)的条件下,过点A(1,﹣3)的直线n与抛物线y=x2也相切,求直线n的函数表达式,并求出直线m与直线n的交点坐标;
(3)如图,已知直线y=kx+3(k为常数且k≠0)与抛物线y=x2交于C、D,过点C、D分别作抛物线的切线,这两条切线交于点P,过点P作x轴的垂线交CD于点Q,试说明点Q是CD的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc883f5b9f5a2dae45bb3ede204ee4e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c8651570a472557dec41ba186535b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/053cc13b7439ab969026b25f25cbd74b.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2960143753560064/2962055972110336/STEM/3053c89a-bffa-4cd5-ba3b-04ea928130c2.png?resizew=232)
(1)直线m:y=2x﹣1与抛物线y=x2相切吗?如相切,请求出切点坐标;
(2)在(1)的条件下,过点A(1,﹣3)的直线n与抛物线y=x2也相切,求直线n的函数表达式,并求出直线m与直线n的交点坐标;
(3)如图,已知直线y=kx+3(k为常数且k≠0)与抛物线y=x2交于C、D,过点C、D分别作抛物线的切线,这两条切线交于点P,过点P作x轴的垂线交CD于点Q,试说明点Q是CD的中点.
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【推荐2】如图1所示,直角坐标系中,二次函数
交x轴于
,
,在y轴上有点
.
(1)求二次函数的表达式.
(2)点D是第二象限内的抛物线上一动点,连接
和
.
①连接
,当
时,求出点D的坐标;
②当
,求出点D坐标;
(3)如图3,若点P是直线
上的动点,连接
和
,当
最大时,则点P的坐标为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b50b33875af1433e9fa2de88530432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eca3721ae93c871b8cc793f0c5da266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96625dcbaf8dc178adb1efa5e3671f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aae5c3422ae259b28cbb76c00b64c9c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/8eebd8d0-91ac-4efb-a545-627271f0de5f.png?resizew=441)
(1)求二次函数的表达式.
(2)点D是第二象限内的抛物线上一动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710a1a0665139eab58e18356d19e06f2.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48cc25c0bc4772fd2893f8fcc91f87a5.png)
(3)如图3,若点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e39a7adfe03663a9387b79a7627192.png)
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【推荐1】如图,在△ABC中, tan∠ABC=
,∠C=45°,点D、E分别是边AB、AC上的点,且DE∥BC,BD=DE=5,动点P从点B出发,沿B-D-E-C向终点C运动,在BD-DE上以每秒5个单位长度的速度运动,在EC上以每秒
个单位长度的速度运动,过点P作PQ⊥BC于点Q,以PQ为边作正方形PQMN,使点B、点N始终在PQ同侧. 设点P的运动时间为
(
)(
>0),正方形PQMN与△ABC重叠部分图形的面积为S.
(1)当点P在BD-DE上运动时,用含
的代数式表示线段DP的长.
(2)当点N落在AB边上时,求
的值.
(3)当点P在DE上运动时,求S与
之间的函数关系式.
(4)当点P出发时,有一点H从点D出发,在线段DE上以每秒5个单位长度的速度沿D-E-D连续做往返运动,直至点P停止运动时,点H也停止运动.连结HN,直接写出HN与DE所夹锐角为45°时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(1)当点P在BD-DE上运动时,用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)当点N落在AB边上时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当点P在DE上运动时,求S与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)当点P出发时,有一点H从点D出发,在线段DE上以每秒5个单位长度的速度沿D-E-D连续做往返运动,直至点P停止运动时,点H也停止运动.连结HN,直接写出HN与DE所夹锐角为45°时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436146280669184/2436356308090880/STEM/9fb6bd6299b149cb8f5efbfe6c8c083f.png?resizew=201)
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【推荐2】抛物线y=ax2+c(a<0)与x轴交于A、B两点,顶点为C,点P在抛物线上,且位于x轴上方.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/d121f92c-cc79-4219-9e7a-80ebe66c017d.png?resizew=469)
(1)如图1,若P(1,2),A(-3,0).
①求该抛物线的解析式;
②若D是抛物线上异于点P一点,满足∠DPO=∠POB,求点D的坐标;
(2)如图2,已知直线PA、PB与y轴分别交于E、F两点.当点P运动时,
是否为定值?若是,试求出该定值;若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/d121f92c-cc79-4219-9e7a-80ebe66c017d.png?resizew=469)
(1)如图1,若P(1,2),A(-3,0).
①求该抛物线的解析式;
②若D是抛物线上异于点P一点,满足∠DPO=∠POB,求点D的坐标;
(2)如图2,已知直线PA、PB与y轴分别交于E、F两点.当点P运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80e297f948e29c27e18f6dd30823c30.png)
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【推荐3】在平面直角坐标系中,抛物线y=ax2+bx+c(a≠0)与x轴交于A,B两点(A在B的左侧),与y轴交于点C(0,6),其中AB=8,tan∠CAB=3
(2)点P是直线BC上方抛物线上一点,过点P作PD//AC交x轴于点D,交BC于点E,求
BE的最大值及点P的坐标.
(3)将该抛物线沿射线CA方向平移2
个单位长度得到抛物线y1,平移后的抛物线与原抛物线相交于点F,点G为抛物线y1的顶点,点M为直线FG上一点,点N为平面上一点.在(2)中,当
BE的值最大时,是否存在以P、E、M、N为顶点的四边形是菱形,若存在,直接写出点N的坐标;若不存在,请说明理由.
(2)点P是直线BC上方抛物线上一点,过点P作PD//AC交x轴于点D,交BC于点E,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8d65aa0458864c6970daa90d67722d.png)
(3)将该抛物线沿射线CA方向平移2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8d65aa0458864c6970daa90d67722d.png)
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【推荐1】如图,已知抛物线
经过
,
两点,与
轴的交点
.
(2)点
在第二象限的抛物线上,且
,点
从点
出发,在线段
上以每秒
个单位长度的速度向点
运动,同时点
从点
出发以每秒1个单位长度的速度向点
运动,当其中一个点到达终点时,另外一个点也停止运动,设运动时间为
秒,求运动时间为多少时,
的面积最大,并求出最大面积和点
坐标;
(3)在(2)的条件下,将
绕平面内一点
顺时针旋转
得到
,使得点
落在直线
上,已知直线
的关系式为
.
①连接
,
,
所在直线与直线
交于点
,若
,求点
的横坐标.
②若点
坐标为
,连接
,
,则
的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b736d8cb466f0dad19f905000aba4da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5694bc08f7a0c0ae7125aed39d00b2b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b532b51e584020507d40c057c0527023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392b9e1a179a6676362679354a9e7e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3387702902ac9bef072b43b8faa45caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39e210795a966bd5dc1293479ab1988b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4b4c7dc317e98b9305f8f85ab62058.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827be85b8f921007a5cf9edb64bd3491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d12d8869800a919dd8a10dbd1666a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25c39d90e723c654b028d4286d05d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b250432e7a8be11bd9f341edd91b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acdbbf6e8a9bec489d327adffe2c027.png)
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【推荐2】如图,抛物线
与
轴交于
,
两点(点
在点
的左侧),且点
为
,与
轴交于点
,直线
经过
,
两点,点
是第一象限内抛物线上的一个动点,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/bb938574-14c2-449c-b83b-6a0a849f5108.png?resizew=182)
(1)求抛物线的函数表达式;
(2)直线
的解析式记为
,当
时,直接写出
的取值范围;
(3)设点
的横坐标为
,四边形
的面积为
,求
的最大值并求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442834866daf52da017a459b05d8031b.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec32b9cfee142d1d4f68ab4771de77c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/bb938574-14c2-449c-b83b-6a0a849f5108.png?resizew=182)
(1)求抛物线的函数表达式;
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed06ccefffc165f9c77250cd28301d8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22cccd1f9e838f8065f004ac14377b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f7c674f87a67fde99afceb3cfd8189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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