如图,已知点A、C、E和点B、F、D分别是∠O两边上的点,且
,
,
、
交于点M,
、
交于点N.
![](https://img.xkw.com/dksih/QBM/2022/10/19/3090927068807168/3091850967130112/STEM/c157621f0a2344bbb6634daead91e308.png?resizew=221)
(1)求证:
;
(2)若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb3592587409d4ba79af247adcae44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74a493bb6f422b658bdc81246a2a4b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/10/19/3090927068807168/3091850967130112/STEM/c157621f0a2344bbb6634daead91e308.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d34008cf7472e414d7ba5d5d61b0893.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083e851d67981ca6695374ef4dc9c07b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f793fdb0421177ce0b40fc8c4959ce47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
22-23九年级上·上海浦东新·阶段练习 查看更多[3]
上海市浦东新区江镇中学2022-2023学年九年级上学期9月月考试数学试卷(已下线)第二十五章 图形的相似(B卷-拔高卷)-【单元测试】2022-2023学年九年级数学分层训练AB卷【冀教版】(已下线)第19课 由平行线截得的比例线段-【帮课堂】2022-2023学年九年级数学上册同步精品讲义(浙教版)
更新时间:2022-10-20 17:29:48
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,
,
.点
从点
出发沿
方向以每秒2个单位长的速度向点
匀速运动,同时点
从点
出发沿
方向以每秒1个单位长的速度向点
匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点
、
运动的时间是
秒
.过点
作
于点
,连接
、
.
(1)求证:四边形
是平行四边形;
(2)四边形
能够成为菱形吗?如果能,求出相应的
值;如果不能,说明理由.
(3)当
为何值时,
为直角三角形?请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在平行四边形ABCD中,G是DC的延长线上点,AG分别交BD和BC于点E、F.若AB=12,AE=8,CG=3.
(1)求证:
GDA∽
ABF;
(2)求EF的长.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)求EF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/80ffeb84-c082-4981-b9da-f67786397f60.png?resizew=219)
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,AB是⊙O的直径AC是弦,∠BAC的平分线AD交⊙O于点D,DE⊥AC交AC的延长线于点E,连接OE,OE交AD于点F.
(1)求证:DE是⊙O的切线;
(2)若
,求
的值;
(1)求证:DE是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf253af4f8c82dad9e17ec2eae47346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929e72e9d26c3bda1fba680ca48cd95d.png)
![](https://img.xkw.com/dksih/QBM/2020/5/27/2471607429332992/2471947985879040/STEM/9c4365e125924ff0b507520a10adba40.png?resizew=162)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,F为四边形
边
上一点,连接
并延长交
延长线于点E,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/cacf352d-0541-4a07-8ed8-e6697431c450.png?resizew=143)
(1)求证:
;
(2)若四边形
为平行四边形,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/cacf352d-0541-4a07-8ed8-e6697431c450.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281ce512e137e32079e9c4b0216d194d.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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