如图,
是
的直径,C为
下方半圆上一动点,
交
于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/660ee075-0945-45e4-853b-293bfa241d81.png?resizew=214)
(1)求证:
;
(2)已知
半径为r,设
,求x与y的关系式;
(3)点P为
上方圆外一点,且
,连结
,
交上半圆于点E,已知当
时
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daab19a387d230fef54f07ffbcebdf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/660ee075-0945-45e4-853b-293bfa241d81.png?resizew=214)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a313a8a3cc7d4bf0b56a76697a51ca8.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6f82b1fef9227748fdecc3a25feadd.png)
(3)点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205b59ea0034d7fe8c4cc3139dfd8646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1651898404ff2e1ca7aff4a320c579f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7bcd999ed06c7283d2b3d61e4236d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/806c0ee9c41c0accc711dd325aefa26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe730f97da608f0fae54069bf7c687bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08af22e8ce162df2cf8031feabbc2cbc.png)
更新时间:2024-02-23 08:41:45
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解答题-证明题
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【推荐1】如图,点E是平行四边形ABCD对角线AC上一点,点F在BE延长线上,且EF=BE,EF与CD交于点G.
(1)求证:DF∥AC;
(2)连接DE、CF,若2AB=BF,且G恰好是CD的中点,求证:四边形CFDE是矩形;
(3)在(2)的条件下,若四边形CFDE是正方形,且BC=80,求AB的长.
(1)求证:DF∥AC;
(2)连接DE、CF,若2AB=BF,且G恰好是CD的中点,求证:四边形CFDE是矩形;
(3)在(2)的条件下,若四边形CFDE是正方形,且BC=80,求AB的长.
![](https://img.xkw.com/dksih/QBM/2021/7/23/2770234855374848/2776325382668288/STEM/d0a856dc30c34bf3bf21072b7eb64f67.png?resizew=190)
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【推荐2】(1)数学兴趣小组同学将制作的
和
摆放成如图①所示的位置,且
,
,判断
和
的数量关系,并说明理由;
![](https://img.xkw.com/dksih/QBM/2023/1/3/3144851808174080/3158872067989504/STEM/aeda8d56abf947c0a7bd76d3c3858071.png?resizew=152)
(2)如图②,在
中,
,将线段
绕点C顺时针旋转
(
),得到线段
,连接
、
.小组同学发现无论
为何值,
的大小不变,请你计算这个定值,并写出计算过程;
![](https://img.xkw.com/dksih/QBM/2023/1/3/3144851808174080/3158872067989504/STEM/7f31be79074743e08db55f54529a8955.png?resizew=216)
(3)在第(2)问的基础上,在图②中作
的平分线
交
于点F,交
的延长线于点E,连接
.用等式表示线段
、
、
之间的数量关系;并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734f99be638f65302533fa0a6a855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2023/1/3/3144851808174080/3158872067989504/STEM/aeda8d56abf947c0a7bd76d3c3858071.png?resizew=152)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a5c960a2b98b3b679b32b799d861f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://img.xkw.com/dksih/QBM/2023/1/3/3144851808174080/3158872067989504/STEM/7f31be79074743e08db55f54529a8955.png?resizew=216)
(3)在第(2)问的基础上,在图②中作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2023/1/3/3144851808174080/3158872067989504/STEM/b2b497c948b7485aaf046d51208da124.png?resizew=199)
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【推荐1】如图,AB是⊙O的直径,弦AC=BC,E是OB的中点,连接CE并延长到点F,使EF=CE,连接AF交⊙O于点D,连接BD,BF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/68c3fe11-40bf-47df-b274-461358e58eb9.png?resizew=119)
(1)求证∶直线BF是⊙O的切线;
(2)若AF长为5
,求⊙O的半径及DB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/68c3fe11-40bf-47df-b274-461358e58eb9.png?resizew=119)
(1)求证∶直线BF是⊙O的切线;
(2)若AF长为5
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐2】如图,在平面直角坐标系中,二次函数y=a(x﹣1)(x﹣5)(a>0)的图象与x轴交于A、B两点(点A在点B的左侧),与y轴交于P点,过其顶点C作直线CH⊥x轴于点H.
(1)若∠APB=30°,请直接写出满足条件的点P的坐标;
(2)当∠APB最大时,请求出a的值;
(3)点P、O、C、B能否在同一个圆上?若能,请求出a的值,若不能,请说明理由.
(4)若a=
,在对称轴
HC上是否存在一点Q,使∠AQP=∠ABP?若存在,请直接写出点Q的坐标;若不存在,请说明理由.
(1)若∠APB=30°,请直接写出满足条件的点P的坐标;
(2)当∠APB最大时,请求出a的值;
(3)点P、O、C、B能否在同一个圆上?若能,请求出a的值,若不能,请说明理由.
(4)若a=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://img.xkw.com/dksih/QBM/2019/7/9/2243183798239232/2243361632632832/STEM/bc74352f5dd9470a8b9db4c707357634.png?resizew=5)
![](https://img.xkw.com/dksih/QBM/2019/7/9/2243183798239232/2243361632632832/STEM/11e5b7850251478883f9fd6ff5b9d393.png?resizew=377)
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【推荐1】如图,在
中,点
在边
上,且
,已知
,
.
(1)求
的度数;
(2)我们把有一个内角等于
的等腰三角形称为黄金三角形.它的腰长与底边长的比(或者底边长与腰长的比)等于黄金比
.
①写出图中所有的黄金三角形,选一个说明理由;
②求
的长;
③在直线
或
上是否存在点
(点
、
除外),使
是黄金三角形?若存在,在备用图中画出点
,简要说明画出点
的方法(不要求证明);若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fa696c52ea83507b14ae85b37a2fa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad7f8fa5f627ec55400a3cadd912801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f976007b8d754ac3bf5793ed2fce37.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f693e870d5ccdced6e023cc4f7d621.png)
(2)我们把有一个内角等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb6b14146fe92c0d8216e32926ad4371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ac144ea34a0a5abced9ea7736f37ec.png)
①写出图中所有的黄金三角形,选一个说明理由;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
③在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9017cfed5393f9b21602107ed164c733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101758422433792/2104556894715904/STEM/a0e4c6a1bff54200a9ad6bee72612327.png?resizew=213)
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【推荐2】如图,在平面直角坐标系中,抛物线
交x轴于A,B两点(点A在点B的左边),交y轴负半轴于点C.
①直接写出A,B,C三点的坐标;
②若抛物线上有一点D,∠ACD=45°,求点D的坐标;
(2)如图2,过点E(m,2)作一直线交抛物线于点P,Q两点,连接AP,AQ,分别交y轴于M,N两点,求证:OM•ON是一个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15a9d4de3a13eca5b5886d56ebe75a7.png)
①直接写出A,B,C三点的坐标;
②若抛物线上有一点D,∠ACD=45°,求点D的坐标;
(2)如图2,过点E(m,2)作一直线交抛物线于点P,Q两点,连接AP,AQ,分别交y轴于M,N两点,求证:OM•ON是一个定值.
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【推荐3】如图1,点A是反比例函数
(x>0)图象上的任意一点,过点A作AB∥x轴,交另一个反比例函数
(k<0,x<0)的图象于点B.
![](https://img.xkw.com/dksih/QBM/2015/7/24/1573885220175872/1573885226418176/STEM/618a1acc6a69409a9ec8b16fa6c0281c.png)
(1)若S△AOB=3,则k=______;
(2)当k=-8时:
①若点A的横坐标是1,求∠AOB的度数;
②将①中的∠AOB绕着点O旋转一定的角度,使∠AOB的两边分别交反比例函数y1、y2的图象于点M、N,如图2所示.在旋转的过程中,∠OMN的度数是否变化?并说明理由;
(3)如图1,若不论点A在何处,反比例函数
(k<0,x<0)图象上总存在一点D,使得四边形AOBD为平行四边形,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d815a70786897257baee6e1fc41033d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d105b74c40724a7da626e7c42afbf5fa.png)
![](https://img.xkw.com/dksih/QBM/2015/7/24/1573885220175872/1573885226418176/STEM/618a1acc6a69409a9ec8b16fa6c0281c.png)
(1)若S△AOB=3,则k=______;
(2)当k=-8时:
①若点A的横坐标是1,求∠AOB的度数;
②将①中的∠AOB绕着点O旋转一定的角度,使∠AOB的两边分别交反比例函数y1、y2的图象于点M、N,如图2所示.在旋转的过程中,∠OMN的度数是否变化?并说明理由;
(3)如图1,若不论点A在何处,反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d105b74c40724a7da626e7c42afbf5fa.png)
![](https://img.xkw.com/dksih/QBM/2015/7/24/1573885220175872/1573885226418176/STEM/aafd11d2b3d34370903cd801879812e9.png)
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【推荐1】如图,
中,
,
为
上一点,以
为直径的
与
相切于点
,交
于点
,
,垂足为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/a78335cf-8b25-4ee2-8751-37fd3d5e99ec.png?resizew=171)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaa106172cc7b3db22ebbcbc1fe84c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/24/a78335cf-8b25-4ee2-8751-37fd3d5e99ec.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ee3e567700c1d5b17944ffc6229c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402c0f9eecfcdf73f9e87ca82a6f2c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】已知抛物线
与
轴的交点
,其中
,与
轴交于点
,
为坐标原点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/c827a21d-d9f6-4724-b404-04ce7d7ab031.jpg?resizew=368)
(1)求
(用含有
的式子表示);
(2)如图,点
是抛物线的顶点,
,求
的值;
(3)当
时,设抛物线的对称轴与
轴交于点
,过点
的直线
与抛物线交于点
(
在对称轴右侧),取
中点
,过点
作
轴,交抛物线于点
,是否存在点
,使线段
的长度为
?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6337d68cd5653767e3a1889b8b2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94cbef1c2e9585e8b4ef10e66528fa28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c7e973d4aeb2d23f47a2be87c50312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/c827a21d-d9f6-4724-b404-04ce7d7ab031.jpg?resizew=368)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bf5a0a8d4c8d8661804db281bd931f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711b21672fd907c5c92fee1d649e7003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2bc6cf29c24d4fb63c0f1870caffc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ad58997b9dc0b341c9af08f0cd1fbe.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf783d3172debc69f963495e5bff78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b77a750c8b127476bbb41e1eb289750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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