(1)解不等式组
;
(2)尺规作图:已知线段a,求作等腰直角三角形,使其斜边等于线段a.(不写作法,保留作图痕迹,并描黑).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d04368f76a777b17b29ac16287204a2.png)
(2)尺规作图:已知线段a,求作等腰直角三角形,使其斜边等于线段a.(不写作法,保留作图痕迹,并描黑).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/17bbb43f-4fc6-4bc9-bdc0-6482ab0241ee.png?resizew=166)
更新时间:2022-07-02 15:04:01
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解答题-问答题
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【推荐1】如果一个不等式(组)的解集中包含一个方程的解,那么就称这个不等式(组)的解集为这个方程的“青一范围”,例如:不等式
的解集是
,它包含了方程:
的解,因此
是
的“青一范围”.
(1)判断:①
;②
;③
;其中不等式的解集是方程
的“青一范围”有______;
(2)已知关于x的不等式组
的解集是关于x的方程
的“青一范围”,求t的取值范围;
(3)若关于x的不等式组
的解集是关于x的方程
的“青一范围”,且符合条件要求的整数t之和为9,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74798b3e40a2f899de89815f6ddf67a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c5c3e63c6114fb238e73202e02af08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22708b8cbc7b72225d9515e3da2f9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c5c3e63c6114fb238e73202e02af08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22708b8cbc7b72225d9515e3da2f9c2.png)
(1)判断:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73f3c28fd73efc1713f6194287fa96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7c5292f6eca032426b0248b61f3c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c183b9e23eec65c0fe3de3aa44fdbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35557d92bc29cd0b5b8cb352a5cc02ba.png)
(2)已知关于x的不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e044bc49dc2726f9e4c3c3bb0d2b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0912c09080d2a4e4a22984fbed49405e.png)
(3)若关于x的不等式组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3458946c3f05bb7f85917a732a38ff16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eb78a78836353a3876d20a1d9721197.png)
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解答题-应用题
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【推荐1】如图1,圆形拱门是中国古典园林建筑元素之一,圆形拱门有着圆满、完美的美好寓意、
(2)已知拱门高
(优弧
中点到
的距离),
,
,求拱门的圆弧半径.
(2)已知拱门高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee5d6fb4ed1105299e1b0aa29f36d0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-作图题
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【推荐2】如图,在矩形
中,
,点
在
上,连接
.
作
,垂足为点
;(要求:尺规作图,不写作法和结论,保留作图痕迹).
(2)根据(1)中作图,求证:
.
证明:
四边形
是矩形,
且
.
,
①______.
.
,
.
在
与
中,
,
②______.
③______.
,
.
④______
.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9199a3de404cb13ae7710f73db5c8f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5f235f4087a0ac6aaa8a6a0e7b2164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)根据(1)中作图,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f439c70fb0e565a074e09066ce9233.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d463a16ffed633d88a1a8801ca05c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf073ec14977c537342bec1b380e0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c57a3d63ead28b988ff586958fa05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a14560e5ce6678ec6316a3e0bb9c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cc741b6fba7ce725bf7bb6270c8ba2.png)
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在
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解答题-作图题
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【推荐1】如图:已知OA和OB两条公路,以及C,D两个村庄,建立一个车站P,要求车站到OA,OB两条公路的距离相等,且使
为等腰三角形,请作出车站P的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854712870559744/2859463156924416/STEM/5a96f9b6b9f74e239013a76161373d9c.png?resizew=169)
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解答题-作图题
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适中
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【推荐2】1.如图1,
中,
,请用直尺和圆规作一条直线,把
分割成两个等腰三角形(不写作法,但须保留作图痕迹).
2.已知内角度数的两个三角形如图2、图3所示.请你判断,能否分别画一条直线把它们分割成两个等腰三角形?若能,请画出直线并写出分割成的两个等腰三角形顶角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
2.已知内角度数的两个三角形如图2、图3所示.请你判断,能否分别画一条直线把它们分割成两个等腰三角形?若能,请画出直线并写出分割成的两个等腰三角形顶角的度数.
![](https://img.xkw.com/dksih/QBM/2011/12/5/1573296830218240/1573296851001344/STEM/c0279eb2275046139152a8b6d4a65f28.png?resizew=433)
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解答题-问答题
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【推荐1】如图,△ABC中,∠ABC=90°,AC=25cm,BC=15cm
(1)设点P在AB上,若∠PAC =∠PCA.求AP的长;
(2)设点M在AC上.若△MBC为等腰三角形,求AM的长.
(1)设点P在AB上,若∠PAC =∠PCA.求AP的长;
(2)设点M在AC上.若△MBC为等腰三角形,求AM的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/27/3990bcd9-2402-41fc-b7db-a239f0d0f98a.png?resizew=158)
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解答题-证明题
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【推荐2】如图,OA=OB=13cm,AB=24cm,⊙O的直径为10cm.求证:AB是⊙O的切线.
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