如图,有一块矩形塑料模料
,长为10cm,宽为4cm.将你的手中足够大的直角三角板
的直角顶点
落在
边上(不与
、
重合),在
上适当移动三角板顶点
.当三角板两直角边刚好分别通过点
与点
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d0996ac21be724a170824a48b86d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/14/ed92c486-89f7-439e-b6f4-71c2193aceb5.png?resizew=151)
22-23九年级上·湖南株洲·期中 查看更多[2]
湖南省株洲市渌口区2022-2023学年九年级上学期期中数学试题(已下线)专题4.44 相似三角形几何模型(一线三等角)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)
更新时间:2023-08-05 17:51:34
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解答题-问答题
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适中
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名校
【推荐2】某中学在商店购进甲、乙两种品牌的书包,已知购买一个乙品牌书包比购买一个甲品牌书包多花30元,且用300元购买甲品牌书包的数量比用320元购买乙品牌书包的数量多2个.
(1)求购买一个甲品牌、一个乙品牌的书包各需多少元?
(2)该学校决定用不超过2900元购买甲品牌、乙品牌的书包共40个,至少购买甲品牌书包多少个?
(1)求购买一个甲品牌、一个乙品牌的书包各需多少元?
(2)该学校决定用不超过2900元购买甲品牌、乙品牌的书包共40个,至少购买甲品牌书包多少个?
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解答题-作图题
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适中
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【推荐1】如图,
的三个顶点坐标分别为
、
、
,
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991492707655680/2992093370515456/STEM/a22e2f1b-9708-476a-a32f-5f1d5eaf9143.png?resizew=256)
(1)以
为旋转中心,将
逆时针旋转
得到
;
(2)将
平移,使平移后点
、
的对应点
、
分别在
轴和
轴上,画出平移后的
;
(3)借助网格,利用无刻度直尺画出
的中线
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c59f0e35b7ae5206e45878934482b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6419152065edb8cabf887b65adb4a73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10eba0e8e9ae3fb3967be44322c66d2.png)
![](https://img.xkw.com/dksih/QBM/2022/5/31/2991492707655680/2992093370515456/STEM/a22e2f1b-9708-476a-a32f-5f1d5eaf9143.png?resizew=256)
(1)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
(3)借助网格,利用无刻度直尺画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828dc8dc7259c510b6d63abf40f60e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c94a6f24e6fae9888155f8461f878d.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图矩形
的对角线
在
轴上,点
的坐标分别为
,反比例函数
的图象经过点
.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586390059958272/2586437870788608/STEM/c3d60e26b4e3421ea5bf08edb91e39e3.png?resizew=207)
(1)求
的值及点
的坐标;
(2)判断点
是否在该反比例函数的图象上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c369c56c1df4e440a1cde55a421211fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586390059958272/2586437870788608/STEM/c3d60e26b4e3421ea5bf08edb91e39e3.png?resizew=207)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解答题-证明题
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适中
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【推荐1】如图,在△ABC中,AB=AC,∠A=36°,BD是∠ABC的平分线.
![](https://img.xkw.com/dksih/QBM/2020/8/31/2539931105869824/2546223312781312/STEM/a1762a1e5b394f058a35559dc3de55ef.png?resizew=149)
(1)求证:△ABC∽△BCD
(2)求
的值.
![](https://img.xkw.com/dksih/QBM/2020/8/31/2539931105869824/2546223312781312/STEM/a1762a1e5b394f058a35559dc3de55ef.png?resizew=149)
(1)求证:△ABC∽△BCD
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8c176e0c2b435675a3b8efab0e498d.png)
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解题方法
【推荐2】如图,AB为⊙O的直径,AE是⊙O的弦,C是弧AE的中点,弦CG⊥AB于点D,交AE于点F,过点C作⊙O的切线,交BA延长线于点P,连接BE
(1)求证:PC∥AE;
(2)若sin∠P=
,CF=5,求BE的长.
(1)求证:PC∥AE;
(2)若sin∠P=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/5/a8689863-085a-4578-b073-7c97298f11a5.jpg?resizew=183)
您最近一年使用:0次