在平面直角坐标系中,矩形OABC的边OA、OC分别落在x轴、y轴上,O为坐标原点,且OA=8,OC=4,连接AC,将矩形OABC对折,使点A与点C重合,折痕ED交BC于点D,交OA于点E,连接AD,如图①.
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170272128630784/2171593528680448/STEM/b1f3a07f95d0466a8897b08e1a918bfd.png?resizew=529)
(1)求点D的坐标和AD所在直线的函数关系式;
(2)⊙M的圆心M始终在直线AC上(点A除外),且⊙M始终与x轴相切,如图②.
①求证:⊙M与直线AD相切;
②圆心M在直线AC上运动,在运动过程中,能否与y轴也相切?如果能相切,求出此时⊙M与x轴、y轴和直线AD都相切时的圆心M的坐标;如果不能相切,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/28/2170272128630784/2171593528680448/STEM/b1f3a07f95d0466a8897b08e1a918bfd.png?resizew=529)
(1)求点D的坐标和AD所在直线的函数关系式;
(2)⊙M的圆心M始终在直线AC上(点A除外),且⊙M始终与x轴相切,如图②.
①求证:⊙M与直线AD相切;
②圆心M在直线AC上运动,在运动过程中,能否与y轴也相切?如果能相切,求出此时⊙M与x轴、y轴和直线AD都相切时的圆心M的坐标;如果不能相切,请说明理由.
2017·江苏扬州·二模 查看更多[2]
更新时间:2017-05-29 09:41:02
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【推荐1】综合与探究
如图1,在平面直角坐标系中,点
是坐标原点,点
在
轴的正半轴上,点
的坐标为
,四边形
是菱形,直线
于点
,交
轴于点
,连接
.
(1)点
的坐标是______;
(2)求直线
的函数解析式;
(3)如图2,动点
从点
出发,沿折线
方向以1个单位长度/秒的速度向终点
匀速运动,设
的面积为
(
),点
的运动时间为
秒,求
与
之间的函数关系式(要求写出自变量
的取值范围)
如图1,在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/560ab719df4b08d983743834d6d2bbc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b9a2f5c9877086517ac6d0cd9e30af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/cd93bf20-5853-42fd-9272-ff73c8a9a229.png?resizew=168)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图2,动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413676e65f7ce58dabb00fb925552866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/f923df2a-0f30-4ec2-ae74-9b0f10f507ab.png?resizew=165)
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【推荐2】如图,直线
的表达式为:
,且
与
轴交于点
,与
轴交于点
,直线
的表达式为
,
经过点
,
,
,
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/4/23/2447705666371584/2448492121047040/STEM/0685c4bb15fd4285b74c92bc5efcc52c.png?resizew=151)
(1)求直线
的函数表达式;
(2)直接写出点
的坐标________;
(3)如果点
在直线
上,满足
的面积是
面积的2倍,求点
的坐标;
(4)把
向左平移
个单位到
的位置,当
取得最小值时,直接写出
的值
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c653f3ac494070e375977c3bcb3ede1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.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/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
(2)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d9ccc4246c82939d8a659db9f28a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd51caff8d6cd6d3478fb4659789d8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504388564cf808feff52c16bae297a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504388564cf808feff52c16bae297a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a317ecd88b999835361d837b52b3538.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c0312474746be3664f6f22629ffab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
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【推荐1】如图1,在平面直角坐标系中,矩形
的边
在x轴的正半轴上,
在y轴的正半轴上,
、
的长分别是方程
的两根(
),抛物线
过B、C两点.
(1)求抛物线的解析式;
(2)如图2,将
沿
折叠,使点A落在抛物线上的点D处,求
的面积;
(3)有一平行于y轴的动直线l,从y轴开始以一个单位长度每秒的速度向右平移,平移到与
重合为止.直线l扫过
的面积为S(如图3的阴影部分),运动时间为t秒,试求S与t的函数关系式,并写出相应t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b60076ad90f01480cc1b28fc84b1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde9e36435fe265706536becbbe5705c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dd94498f9faf72c2194e631cff445b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/2220351a-3355-4e5e-8017-b589aa616692.png?resizew=627)
(1)求抛物线的解析式;
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
(3)有一平行于y轴的动直线l,从y轴开始以一个单位长度每秒的速度向右平移,平移到与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,在矩形
中,
,
,点
是边
上的一个动点(不与点
,
重合),将
沿
折叠,点
落在点
;在边
上取点
,将
沿
折叠,点
落在点
,且有
,
,
三点在同一条直线上.
时,试求
的值;
(2)当射线
过点
时,试求
的值;
(3)在点
的运动过程中,是否存在
的情况?若存在,直接写出此时
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/403d74859e7b8b4cebf40add6e92b0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7cf60424f2a5762dcacbf8fa82f2694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a0367c3fe3c5c5dfefec87f641bbde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
(2)当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffb952f86442845da723fd291564484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(3)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1ba548d839b5d5cf74bdd6884cd97c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐1】如图,抛物线
与
轴交于A、B两点,与
轴交于点C,四边形OBHC为矩形,CH的延长线交抛物线于点D(5,-2),连接BC、AD.
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480233252790272/2481010786590720/STEM/0902a476a0214885bfd8bb3223838a7f.png?resizew=135)
(1)将矩形OBHC绕点B按逆时针旋转90°后,再沿
轴对折到矩形GBFE(点C与点E对应,点O与点G对应),求点E的坐标;
(2)设过点E的直线交AB于点P,交CD于点Q.
①当四边形PQCB为平行四边形时,求点P的坐标;
②是否存在点P,使直线PQ分梯形ADCB的面积为1∶3两部分?若存在,求出点P坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71531d795e0d02761faf8d953b31febb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2020/6/8/2480233252790272/2481010786590720/STEM/0902a476a0214885bfd8bb3223838a7f.png?resizew=135)
(1)将矩形OBHC绕点B按逆时针旋转90°后,再沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)设过点E的直线交AB于点P,交CD于点Q.
①当四边形PQCB为平行四边形时,求点P的坐标;
②是否存在点P,使直线PQ分梯形ADCB的面积为1∶3两部分?若存在,求出点P坐标;若不存在,请说明理由.
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【推荐2】综合与实践:在教学中,教师和学生都学习到了新知识,掌握了许多新技能.例如教材八年级下册的数学活动——折纸,就引起了许多同学的兴趣.在经历图形变换的过程中,进一步发展了同学们的空间观念,积累了数学活动经验.
实践发现:对折矩形纸片ABCD,使AD与BC重合,得到折痕EF,把纸片展平;再一次折叠纸片,使点A落在EF上的点N处,并使折痕经过点B,得到折痕BM,把纸片展平,连接AN,如图①.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/7eadca12-30cb-4e48-8633-babb36a54636.png?resizew=509)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/2f3e151d-774b-42cc-984c-4ba5ccfcdc18.png?resizew=269)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/a24be850-7890-4856-aebd-7c772448baa7.png?resizew=268)
(1)折痕BM______(填“是”或“不是”)线段AN的垂直平分线:请判断图中△ABN是什么特殊三角形?
答:______;进一步计算出∠MNE=______°:
(2)继续折叠纸片,使点A落在BC边上的点H处,并使折痕经过点B,得到折痕BG,把纸片展平,如图②,则∠GBN=______°;
(3)拓展延伸:如图③,折叠矩形纸片ABCD,使点A落在BC边上的点
处,并且折痕交BC边于点T,交AD边于点S,把纸片展平,连接
交ST于点O,连接AT,求证:四边形
是菱形.
(4)解决问题:如图④,矩形纸片ABCD中,AB=5,AD=13,折叠纸片,使点A落在BC边上的点
处,并且折痕交AB边于点T,交AD边于点S,把纸片展平.同学们小组讨论后,得出线段
的长度有3,5,6,8,请写出以上4个数值中你认为正确的数值是______.
实践发现:对折矩形纸片ABCD,使AD与BC重合,得到折痕EF,把纸片展平;再一次折叠纸片,使点A落在EF上的点N处,并使折痕经过点B,得到折痕BM,把纸片展平,连接AN,如图①.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/7eadca12-30cb-4e48-8633-babb36a54636.png?resizew=509)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/2f3e151d-774b-42cc-984c-4ba5ccfcdc18.png?resizew=269)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/17/a24be850-7890-4856-aebd-7c772448baa7.png?resizew=268)
(1)折痕BM______(填“是”或“不是”)线段AN的垂直平分线:请判断图中△ABN是什么特殊三角形?
答:______;进一步计算出∠MNE=______°:
(2)继续折叠纸片,使点A落在BC边上的点H处,并使折痕经过点B,得到折痕BG,把纸片展平,如图②,则∠GBN=______°;
(3)拓展延伸:如图③,折叠矩形纸片ABCD,使点A落在BC边上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06b822b110f2c6cc77aa71d8ff1b23d.png)
(4)解决问题:如图④,矩形纸片ABCD中,AB=5,AD=13,折叠纸片,使点A落在BC边上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
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【推荐1】如图,在△ABC中,∠ABC=90°,以AB的中点O为圆心,OA为半径的圆交AC于点D,E是BC的中点,连接DE,OE.
(1)判断DE与⊙O的位置关系,并说明理由;
(2)求证:BC2=2CD•OE;
(3)若
,求OE的长.
(1)判断DE与⊙O的位置关系,并说明理由;
(2)求证:BC2=2CD•OE;
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9647b563f1b88a6853a96b7703c85d1a.png)
![](https://img.xkw.com/dksih/QBM/2018/5/29/1955938651021312/1957362054086656/STEM/435025aa51e1469aa3233d5b6848f511.png?resizew=190)
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【推荐2】如图,
是
的直径,D是
的中点.
于点E,过点D作
的平行线
,连接
并延长与
相交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/8a49b6aa-701a-496b-b541-f301c60c68fa.png?resizew=157)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
,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/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/8a49b6aa-701a-496b-b541-f301c60c68fa.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8838c6a04de37ca2738bebabc41bf0a4.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33fdef7490f18ebf7cb98153c885a0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40bcf5c0ccfc3f1a40c4430246edf4c8.png)
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