阅读下列材料:
已知实数m,n满足
,试求
的值.
解:设
,则原方程变为
,整理得
,
,所以
,因为
,所以
,上面这种方法称为“换元法”,把其中某些部分看成一个整体,并用新字母代替(即换元),则能使复杂的问题简单化.根据以上阅读材料内容,解决下列问题,并写出解答过程.
(1)已知实数x、y满足
,求
值;
(2)已知
的三边为a、b、c(c为斜边),且a、b满足
,
外接圆的半径.
已知实数m,n满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f63e7889194dd388eed961b224bde78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279847760a3af31532efd4dc6969092b.png)
解:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a20d6cce46fdb238eff15570752ce50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee5aa4961b705d28fe350062108dd8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6004bbb28b182cb0695010ed88f1e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bc930dd1ddc515cbb27cff06a8b35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab364036827e64dcb23a25c7e5784ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bed5e7d3421bfaace2a1bf6d62319ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a788b6a5da7f7c8f1d7d8f8a620564c.png)
(1)已知实数x、y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8498925525c43833f19baa5169d45a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ebc856291255f2d4a6c20b982a2442.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefc12c61c95d8e36846a6aac1c9105b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a011d6594c68454bf7e8c4fc101eb71f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36d87153e50e195347e7b7ef685a462.png)
22-23九年级上·江苏常州·期中 查看更多[3]
江苏省常州市溧阳市2022-2023学年九年级上学期期中数学试题(已下线)第08讲 确定圆的条件(2种题型)-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)(已下线)专题09确定圆的条件(2个知识点8种题型1种中考考法)-【帮课堂】2023-2024学年九年级数学上册同步学与练(苏科版)
更新时间:2022-12-06 11:36:33
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【推荐2】解方程:6x4-35x3+62x2-35x+6=0.
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【推荐1】(1)问题提出:如图1,
是边长为4的等边三角形,
的面积为______.
(2)问题探究:如图2,在
中,
,
,求
的最大面积.
(3)问题解决:如图3,有一块矩形铁皮
,
,
,工人师傅想把它裁剪出两块全等且面积最大的
和
,且
,请你在图中画出符合条件的点M,N,并求出此时
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)问题探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)问题解决:如图3,有一块矩形铁皮
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfee8f54978e6b19e3b0a9003f09b5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b0c4b339f44bbac0e275eb0718234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/484d1cd79c2f3230a7bd65ae99a3edae.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/408da6c0-8f28-476f-9a00-8bfbf0ee0a5e.png?resizew=357)
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名校
【推荐2】定义:我们将能完全覆盖某平面图形的圆称为该平面图形的覆盖圆;平面图形的覆盖圆中半径最小的圆称为平面图形的最小覆盖圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/33099e7a-c521-4c1f-b2f3-6f5765b66abf.png?resizew=558)
(1)已知线段
、
的长度为
.
①如图
,线段
的最小覆盖圆的半径为__________;
②如图2,若线段
与
垂直,垂足为
,
与
重合,则该图形的最小覆盖圆的半径为__________;
③如图3,若线段
与
垂直,垂足为
,
在线段
的中点处,则该图形的最小覆盖圆的半径为_____;
(2)如图4,有
个三角形,分别是:①锐角三角形、②直角三角形、③钝角三角形④
满足下列条件:线段
的长度为
,点
在线段
上,且长度为
的线段
与
垂直;它们的最小覆盖圆正好是该三角形的外接圆的是__________(只填序号);
(3)在平面直角坐标系中,已知点
,点
是
轴上的一个动点,当
时,求
的最小覆盖圆的半径以及点
的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/16/33099e7a-c521-4c1f-b2f3-6f5765b66abf.png?resizew=558)
(1)已知线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbdcf4d4784de11ae2331cf54ffa9b3.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
②如图2,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
③如图3,若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)如图4,有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbdcf4d4784de11ae2331cf54ffa9b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf8111bf36bfb6420a734cc51560e9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(3)在平面直角坐标系中,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb3ebcf3430f38e25bd717fb2bbdca25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54cfc1c15c0361cf5b81c03640faede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-证明题
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【推荐3】新定义:如图1(图2,图3),在
中,把
边绕点A顺时针旋转,把
边绕点A逆时针旋转,得到
,若
,我们称
是
的“旋补三角形”,
的中线
叫做
的“旋补中线”,点A叫做“旋补中心”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/08b80fda-70a5-43fb-b039-e28c664d9947.png?resizew=518)
【特例感知】
(1)①若
是等边三角形(如图2),
,则
______________.
②若
(如图3),
,
_____________.
【猜想论证】
(2)在图1中,当
是任意三角形时,猜想
与
的数量关系,并证明你的猜想;(提示:过点
作
且
,连接
,则四边形
是平行四边形)
【拓展应用】
(3)如图4,点A,B,C,D都在半径为5的圆P上,且
与
不平行,
,
是
的“旋补三角形”,点P是“旋补中心”,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/08b80fda-70a5-43fb-b039-e28c664d9947.png?resizew=518)
【特例感知】
(1)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
【猜想论证】
(2)在图1中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759a864313f66e2cd26713e11cdcb9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ac3b64bede56fd018f9bd08ebd938f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83ccde054ec5f3473ede6c07e484290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5faa488659402e00684cf5757ef8c.png)
【拓展应用】
(3)如图4,点A,B,C,D都在半径为5的圆P上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
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