已知
,
,
是
的三边长,且
.
(1)求
,
,
的值;
(2)求
外接圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2671ae30f92746099d1f7d51f950f90.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
23-24九年级上·江苏宿迁·阶段练习 查看更多[3]
江苏省宿迁市沭阳县北丁集初级中学2023-2024学年九年级上学期10月月考数学试题江苏省宿迁市沭阳县2023-2024学年九年级上学期第一次联考数学试题(已下线)专题24.16 点和圆的位置关系(分层练习)-2023-2024学年九年级数学上册基础知识专项突破讲与练(人教版)
更新时间:2023-10-13 13:11:34
|
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解答题-问答题
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适中
(0.65)
【推荐1】王老师在黑板上写下了四个算式:
①32-12=(3+1)(3-1)=8=8×1,
②52-32=(5+3)(5-3)=16=8×2,
③72-52=(7+5)(7-5)=24=8×3,
④92-72=(9+7)(9-7)=32=8×4.
…
认真观察这些算式,并结合你发现的规律,解答下列问题:
(1)请再写出另外两个符合规律的算式:
算式①______;
算式②______.
(2)小华发现上述算式的规律可以用文字语言概括为:“两个连续奇数的平方差能被8整除”,如果设两个连续奇数分别为2n+1和2n-1(n为正整数),请你用含有n的算式验证小华发现的规律.
①32-12=(3+1)(3-1)=8=8×1,
②52-32=(5+3)(5-3)=16=8×2,
③72-52=(7+5)(7-5)=24=8×3,
④92-72=(9+7)(9-7)=32=8×4.
…
认真观察这些算式,并结合你发现的规律,解答下列问题:
(1)请再写出另外两个符合规律的算式:
算式①______;
算式②______.
(2)小华发现上述算式的规律可以用文字语言概括为:“两个连续奇数的平方差能被8整除”,如果设两个连续奇数分别为2n+1和2n-1(n为正整数),请你用含有n的算式验证小华发现的规律.
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解答题-问答题
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适中
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【推荐2】(1)分解下列因式,将结果直接写在横线上:
______,
_______;
(2)观察上述两个多项式的系数,有
.于是小明猜测:若多项式
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①请你用数学式子表示系数a,b,c之间的关系________﹔
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bfd09829e03f1277b23882c7a914f7e.png)
(2)观察上述两个多项式的系数,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673f35739df44477a7d444b727ae0503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f82d7921b225059a5e8936fcccaf38.png)
①请你用数学式子表示系数a,b,c之间的关系________﹔
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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解答题-证明题
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适中
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【推荐2】如图,已知在
中,
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,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1337ce85d29edabcc2fadb9a9cc31ce5.png)
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(1)求证:
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5b21129fa053bb83a3c1e95e0285d1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/2022/10/1/3078361319219200/3080020590714880/STEM/b59267f10ef442808e9dca99ee8a5ed0.png?resizew=124)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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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,点O为边长为1的等边三角形
的外心. 线段
经过点O,交边
于点P, 交边
于点Q. 若
,下表给出了x,
,
的一些数据 (近似值精确到
).
(2)在同一平面直角坐标系
中描出了部分点
.请补全表格中数据的对应点,并分别画出
与
关于x的函数图象;
(3)结合函数图象,解决下列问题:
①当
是等腰三角形时,
关于x的函数图象上的对应点记为
,请在x轴上标出横坐标为a的点;
②当
取最大值时,x的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4640ca711c05515aba71872889f5f5.png)
x | 1 | ||||||||||
1 | |||||||||||
(2)在同一平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6cc6bd5c8e404cdb6a8b1b31db1c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a49c204074a8c99a1793a423c96dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
(3)结合函数图象,解决下列问题:
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63313f7ac7402fcb5a9a840db64c6f08.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,菱形
的对角线
与
交于点E,
,
的外接圆为
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![](https://img.xkw.com/dksih/QBM/2021/11/3/2843462012248064/2849545972793344/STEM/bf384e42-7715-4cce-9cd7-eeb03cc2a95f.png)
(1)求
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(2)分别判断点D和点E与
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![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e638781b0a869797a9cabca867398c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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(1)求
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(2)分别判断点D和点E与
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您最近一年使用:0次