数学活动课上,张老师引导同学们进行如下探究,如图1,将长为
的铅笔
斜靠在垂直于水平桌面
的直尺
的边沿上,一端A固定在桌面上,图2是示意图.活动一:如图3,将铅笔
绕端点A顺时针旋转,
与
交于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/43f32b00-acd6-4695-9e82-60b223a73eea.png?resizew=246)
(1)数学思考:若
垂直
,设
.
①
的长是______
(用含x的代数式表示),
的长是______
(用含y的代数式表示)
②求y与x的函数关系式.
(2)活动二:若(1)中的x,y满足
,根据(1)中求得的y与x的函数关系式,求x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ff84e2d7f52c7446ef789a54557da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecff6005f926665a926c07ad62e0f032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/43f32b00-acd6-4695-9e82-60b223a73eea.png?resizew=246)
(1)数学思考:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300939c07aa8b4cf92b8db94eb400fc0.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
②求y与x的函数关系式.
(2)活动二:若(1)中的x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581f4963e80a21e9bb1dac9bb79263c4.png)
更新时间:2023-12-18 10:22:59
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【推荐1】解方程:(1) x2-6x+3=0 (2)7x(x-2)=3(x-2)
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【推荐2】阅读下面的例题:分解因式:
.
解:令
得到一个关于
的一元二次方程.
,
,
,
. 解得
;
.
这种因式分解的方法叫求根法,请你利用这种方法 完成下面问题:
(1)已知代数式
对应的方程解为
和
,则代数式
分解后为 ,
的值为 ;
(2)将代数式
分解因式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c992da6adb0a7e2b2fad9a6f84cb27e2.png)
解:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14baa050fb08d1e22bc1f9b1309836b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f872de59b11272497d24ee9340b8bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073ddb8ecd41aa3441ee8f09a056970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ce37a57ebbe8cb52c2adb78e5d24ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6b7ea61151bf65961998270f7f457b.png)
这种因式分解的方法叫求根法,请你
(1)已知代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7dad3fa565d2b953f75bf7343c3f1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fb134b2b48acc99213fff6ccfee65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7dad3fa565d2b953f75bf7343c3f1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)将代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d4f74f3c2c330951faecd4641f2151.png)
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名校
【推荐1】已知矩形周长为18,其中一条边长为x,设另一边长为y.
(1)写出y与x的函数关系式;
(2)求自变量x的取值范围.
(1)写出y与x的函数关系式;
(2)求自变量x的取值范围.
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【推荐2】如图,在四边形 ABCD中,AD//BC,∠A=∠BDC=90°,AD= 2
,∠DBC=30°,点P从点B出发,沿B→A→D→C的路径匀速运动到点C停止,过点P作PQ⊥BD于点Q,设点P运动的路程为x,线段 PQ的长为y.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892992048996352/2949380456620032/STEM/d1dfa587-826a-4c24-8778-69ee2f82aef5.png?resizew=400)
(1)BD=__;
(2)当0≤x≤2时,y与x的函数关系式是 .
(3)设△BPQ的面积为S,求S关于x的函数关系式,并直接写出自变量x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892992048996352/2949380456620032/STEM/d1dfa587-826a-4c24-8778-69ee2f82aef5.png?resizew=400)
(1)BD=__;
(2)当0≤x≤2时,y与x的函数关系式是 .
(3)设△BPQ的面积为S,求S关于x的函数关系式,并直接写出自变量x的取值范围.
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【推荐3】数学活动课上,老师提出一个探究问题:
制作一个体积为,底面为正方形的长方体包装盒,当底面边长为多少时,需要的材料最省(底面边长不超过
,且不考虑接缝).某小组经讨论得出:材料最省,就是尽可能使得长方体的表面积最小.
下面是他们的探究过程,请补充完整:
(1)设长方体包装盒的底面边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d0abc998ec2b780be50b061c3de05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113048da7e93aaf1259cf16511dea1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6de150420b9e9260a473841ecf99df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7ca4466213c0cd57efcce6391e4d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c37668a23bb211627f77ab53f21563c.png)
(2)列出y与x的几组对应值:
… | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | |
… | 80.5 | 42.0 | 31.2 | a | 28.5 | 31.3 |
(说明:表格中相关数值精确到十分位)
表中____________.
(3)在图2的平面直角坐标系中,描出以补全后的表中各对对应值为坐标的点,画出该函数的图象;
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解答题-证明题
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【推荐1】如图,
为圆的直径,
是
上一点,过点
的直线交
的延长线于点
.作
,垂足为
,已知
平分
.
(1)求证:
是
的切线;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b33dddf09abfbd05cd35683b2b70ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94d2506539ad8760cf7ed366c0c537c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/e8d1c404-cca1-4de6-a294-11ad541116dc.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0567aae1731bbd6cd5709398ef8910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6990b8426a4c952f6b9ad99e9f188.png)
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【推荐2】如图
,
和
都是等腰直角三角形,
,连接
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2022/11/18/3112539216633856/3152006822592512/STEM/02588bbbb04a45cb96edc8c4480aef55.png?resizew=297)
(1)求证:
∽
;
(2)如图
,延长图
中
交
于点
,交
于点
求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21c2425db34d83dbe44f3ee3d2c5439b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2022/11/18/3112539216633856/3152006822592512/STEM/02588bbbb04a45cb96edc8c4480aef55.png?resizew=297)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2036191be2322003aaee6bb411868327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031852844b65eb8c3be10fcb6ed11196.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca0af163f4d59eb4125eb28dccc5ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d5a7716a22313b54ebc58e3ab9ccfe.png)
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