19-20九年级·浙江·期末
1 . 如图,在
中,
于点
为
上一点,使得
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fa1ecc203633d4b5e237f5667e7116.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c4d2fb6e861411204359cae5e90140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2696cf1d751d2b022fac7740bd216809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fa1ecc203633d4b5e237f5667e7116.png)
![](https://img.xkw.com/dksih/QBM/2021/3/6/2672173126205440/2672608281657344/STEM/8988e2e2-db2f-408b-90f7-4b4e00315d67.png)
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2 . 定义:如果一个四边形的对角线相等,那么这个四边形叫做平衡四边形.
(1)如图1,在四边形ABCD中,∠DAB=90°,AD=3,AB=4,AC=5.
①判断四边形ABCD是否是平衡四边形,请说明理由;
②若△ACD是等腰三角形,求sin∠DAC的值;
(2)如图2,在平衡四边形ABCD中,∠DAB=90°,AC⊥BD交于点O,AD=2,若S△CBO﹣S△ADO=12,求AB的长.
(1)如图1,在四边形ABCD中,∠DAB=90°,AD=3,AB=4,AC=5.
①判断四边形ABCD是否是平衡四边形,请说明理由;
②若△ACD是等腰三角形,求sin∠DAC的值;
(2)如图2,在平衡四边形ABCD中,∠DAB=90°,AC⊥BD交于点O,AD=2,若S△CBO﹣S△ADO=12,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/30ab4167-42c7-433b-86c8-17b3b9b3bcd7.png?resizew=450)
您最近一年使用:0次
2021-03-05更新
|
389次组卷
|
4卷引用:浙江省宁波市各地区2020-2021学年九年级上学期数学期末大题难题汇编
浙江省宁波市各地区2020-2021学年九年级上学期数学期末大题难题汇编浙江省宁波市镇海区2020-2021学年九年级上学期期末数学试题(已下线)必刷卷05-2021年中考数学考前信息必刷卷(江苏苏州专用)(已下线)惠州卷07-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广东惠州专用)
19-20九年级下·浙江·期末
3 . 如图,已知四边形
和四边形
为正方形,点
在线段
上,点
在同一直线上,且
,连接
,并延长
交
于点
.
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670763264131072/2670800588996608/STEM/362b31bd031a429899bff821188017f6.png?resizew=118)
(1)求
的值.
(2)求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d59b399a569ab257ac0e2333e22d11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a835fd78d5e0634705a4272f4ebd2a25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4e307d2815bce1f83efe90dbfb2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670763264131072/2670800588996608/STEM/362b31bd031a429899bff821188017f6.png?resizew=118)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70f7425df55b966de10dba3b475ad6f.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
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4 . 定义:如图①,
的半径为r,若点
在射线
上,且
,则称点
是点P关于
的“反演点”.
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669947702747136/2670165215879168/STEM/caf99a79b1a44958abce6c2ebc6656a8.png?resizew=555)
(1)如图①,设射线
与
交于点A,若点
是点P关于
的“反演点”,且
,求证:点
为线段
的一个黄金分割点;
(2)如图②,若点
是点P关于
的“反演点”,过点
作
,交
于点B,连接
,求证:
为
的切线;
(3)如图③,在
中,
,以
为直径作
,若点P为
边上一动点,点
是点P关于
的“反演点”,则在点P运动的过程中,线段
长度的取值范围是_____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb7cd5cadb781688bb6defef1b3b0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669947702747136/2670165215879168/STEM/caf99a79b1a44958abce6c2ebc6656a8.png?resizew=555)
(1)如图①,设射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36db165843d0741424145ac634475f82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
(2)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fca904eaf822afe2de5c44fc03b2dbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f047e00bb23d8fa87651056ba4b2e27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ff74733cd730d0e4e7a8355c090daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe29caf61254f41c49125e31bf37614.png)
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5 .
中,
,
,
,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
A.![]() | B.2 | C.![]() | D.![]() |
您最近一年使用:0次
2021-02-06更新
|
127次组卷
|
3卷引用:【新东方】初中数学1155
19-20九年级下·浙江杭州·期末
6 . 如图,直线
,
的三个顶点分别落在
上,
交
于点
,设
与
的距离为
与
的距离为
.若
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/bf6418f1-c1ec-4354-9519-8481cd3fefea.png?resizew=210)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22d591c785a560e84566b27150d068f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8801df26d9cb76bc289b64a3a26902e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95cfe7bf48d01bf39946717d6b293dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e478a786e0f2f77ad31439c968ac6b93.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/bf6418f1-c1ec-4354-9519-8481cd3fefea.png?resizew=210)
A.![]() | B.![]() |
C.![]() | D.![]() |
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7 . 在
中,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2d6204edef8d71d9171eb1d38adafb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e5d4f93699f8dcffb0e7840ca5597e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 在由边长为1的小正方形所组成的网格中,
如图放置,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644574604632064/2646678254518272/STEM/358e6c90-57d8-435c-8b10-56c26920cfbc.png)
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9 . 已知在
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e096ae47951f98adb586bbc8e4a57242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28e3fc39d2b508cc1cae769a5e7266c0.png)
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10 . 将
的各边长都缩小为原来的
,则锐角A的正弦值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
A.不变 | B.缩小为原来的![]() | C.扩大为原来的2倍 | D.缩小为原来的![]() |
您最近一年使用:0次