两个边长分别为a、b、c的直角三角形和一个两条直角边都是c的直角三角形拼成图1.
探索发现:试用不同的方法计算图1的面积,你能发现a、b、c间有什么数量关系?
尝试应用:如图2,在直角三角形ABC中,∠ACB=90°,三边分别为a、b、c,
①若b-a=2,c=10,求此三角形的周长及面积.
②若b=12,a、c均为整数,试求出所有满足条件的a、c的值.
探索发现:试用不同的方法计算图1的面积,你能发现a、b、c间有什么数量关系?
尝试应用:如图2,在直角三角形ABC中,∠ACB=90°,三边分别为a、b、c,
①若b-a=2,c=10,求此三角形的周长及面积.
②若b=12,a、c均为整数,试求出所有满足条件的a、c的值.
![](https://img.xkw.com/dksih/QBM/2017/5/2/1678146213986304/1679917392855040/STEM/acef40ded9c54e3294b10fd273aaa932.png?resizew=263)
更新时间:2017-05-04 21:03:35
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相似题推荐
解答题-问答题
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【推荐1】如图,在平面直角坐标系中,O为坐标原点,
,
,且a,b满足
,点P从B出发,以每秒2个单位的速度沿射线
匀速运动,设点P的运动时间为t秒.
、
的长;
(2)连接
,设
的面积为S,用含t的代数式表示S;
(3)过点P作直线
的垂线,垂足为D,直线
交x轴于点Q,在点P的运动过程中,当
时,求出D点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9486ec9dca95979803bf91ca6c337.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa6e5a12543f954be1a6057c6b2ed51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768ce90b355286c8932f5b8fbc581a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e534b545e86c02abd2a0dc75d32b407.png)
(3)过点P作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d8e49f5e66f61911ea8c3a511db8c8.png)
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【推荐2】对
,
定义一种新的运算
,规定:
(其中
).已知
,
.
(1)求
、
的值;
(2)若
,解不等式组
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6d911d94c6c86de278e5ce5c7a818c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343dc2efff2e4a23640d96272d51c550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98513927078669c3572b347f33c05c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d125c7ebe66bae3f0f4393c9933807c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0349447bddb70a12531302dc283b24ba.png)
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【推荐1】如图1,在
中,点
是
边上一点,连接
,
,边
长为
,
长为
,
,点
是线段
上一个动点,将
沿
所在直线折叠得到
,点
的对应点是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/66b3121d-67aa-430b-afc9-8dcaa48581ec.png?resizew=664)
(1)①
长为______;
②
与
的位置关系为______;
(2)当
落在
边上时,求
的长;
(3)连接
,取
的中点
,连接
交线段
于点
,当
时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4657d1c085c93aebb6372da4b14759.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ad9c4320d0ae02f1ccec8f5e0f9688.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d1d4746a41b162ddbfb317e3ae3f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476da16d2db1d2976bc9ad8b88e3d79f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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(1)①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d42a692432a3ddb16b8057af17a162d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78235115f4fb3e82bf55ce2c76c915c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78235115f4fb3e82bf55ce2c76c915c1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa198faee05d71225dc247b8b086a0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cafbe2751f4f4c5a8e676818195e9111.png)
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解答题-证明题
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【推荐2】如图,
是
的直径,
切
于点
,
交
于点
,
平分
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/2/15/2399781717557248/2400376814387200/STEM/e16e3a5e-6ddb-4718-9390-fa1b00484ff7.png)
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(1)求证:
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
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【推荐1】本学期我们接触到了几何学上的明珠——勾股定理. 千百年来,人们对它的证明趋之若鹜,其中有著名的数学家,也有业余数学爱好者,有普通的老百姓,也有国家总统,下面试举三例,一起领略其魅力.
、
、
的直角三角形和一个两条直角边都是
的直角三角形拼成,试用两种不同的方法表示这个图形的面积,通过计算证明勾股定理;
(2)【应用】如图2,
和
都是等边三角形,点
在
内部,连接
、
、
. 若
,
,
,求
的长;
(3)【提升】如图,在一般三角形
中,
,
,
,
是
边的中线. 在一般三角形中,如何用
、
、
表示
.
![](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/071a7e733d466949ac935b4b8ee8d183.png)
(2)【应用】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8c8b7f52cb48a21fdcff3e837a123d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
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(3)【提升】如图,在一般三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/4fa12efe16e6c4ef0ec08a078ecbb5a2.png)
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【推荐2】勾股定理是人类最伟大的十个科学发现之一,西方国家称之为毕达哥拉斯定理.在我国古书《周髀算经》中就有“若勾三,股四,则弦五”的记载,我国汉代数学家赵爽为了证明勾股定理,创制了一幅“弦图”(如图1),后人称之为“赵爽弦图”,流传至今.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/e7ccd7d3-1a5f-48c6-aa42-893a4213b91f.png?resizew=516)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/14f062d9-7c81-4483-97d5-3f22f8f4a970.png?resizew=409)
(1)①勾股定理的证明,人们已经找到了400多种方法,请从下列几种常见的证明方法中任选一种来证明该定理(以下图形均满足证明勾股定理所需的条件);
②如图1,大正方形的面积是17,小正方形的面积是5,如果将如图1中的四个全等的直角三角形按如图2的形式摆放,求图2中最大的正方形的面积.
(2)如图4、5、6,以直角三角形的三边为边或直径,分别向外部作正方形、半圆、等边三角形,这三个图形中面积关系满足
的有______个;
(3)如图7所示,分别以直角三角形三边为直径作半圆,设图中两个月形图案(图中阴影部分)的面积分别为
、
,直角三角形面积为
,请判断
、
、
的关系______.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/e7ccd7d3-1a5f-48c6-aa42-893a4213b91f.png?resizew=516)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/14f062d9-7c81-4483-97d5-3f22f8f4a970.png?resizew=409)
(1)①勾股定理的证明,人们已经找到了400多种方法,请从下列几种常见的证明方法中任选一种来证明该定理(以下图形均满足证明勾股定理所需的条件);
②如图1,大正方形的面积是17,小正方形的面积是5,如果将如图1中的四个全等的直角三角形按如图2的形式摆放,求图2中最大的正方形的面积.
(2)如图4、5、6,以直角三角形的三边为边或直径,分别向外部作正方形、半圆、等边三角形,这三个图形中面积关系满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/485fd8aa254b523bef30560500ccaf41.png)
(3)如图7所示,分别以直角三角形三边为直径作半圆,设图中两个月形图案(图中阴影部分)的面积分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
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