我国汉代数学家赵爽在证明勾股定理时,创制了一幅“勾股圆方图”,后人称之为“赵爽弦图”.如图,大正方形
由4个全等的直角三角形和一个小正方形
组成,
,
,
.
.
(2)若直角三角形
的面积为
,
,求小正方形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b9fb616a125f49b4b68057c62aa80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c95370ad095bf8caf76fc457e218db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3133ef62aad6bdd6637140620f068fad.png)
(2)若直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2142368b10234525598c5c32dad846.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63957fe9482fe2fb7aa6a1cda2ac0c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
更新时间:2024-02-26 20:35:45
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解答题-问答题
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适中
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名校
【推荐1】把下列各数填入相应的集合内:
,
,
,
,
,
,
,
,
.
(1)有理数集合{ }
(2)无理数集合{ }
(3)负实数集合{ }
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af921bcb8e97da5abb3991c09bbbddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103d54e4b5a6e8dc9c09dbda1179c60c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1802a70810b4150f685fc661ff969f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d401144b1e07b0bc342dbfc6f39b1125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c35c33bcd22d04604b533897bde2b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fda303240e35a04641e7e602dcc414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb18fc27259e82fe22b3efa6e11051c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dc7f6a5d5ca14cee21177931374afd.png)
(1)有理数集合{ }
(2)无理数集合{ }
(3)负实数集合{ }
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解答题-计算题
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适中
(0.65)
名校
【推荐1】(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2478eb0168a1f0e2f8a0c27fc0d9fdaf.png)
(2)先化简,再求值:
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
(3)如果
,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2478eb0168a1f0e2f8a0c27fc0d9fdaf.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022cc682c1ccbfd0ecb279259bce3db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e9222ffc26c0e6bfbf252ab5d8a520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c68abf9b5334d69c45fdfebcbfbe194.png)
![](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
(0.65)
【推荐1】如图,在梯形ABCD中,
,利用面积法证明勾股定理.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276f64bcfa74b44c5ef5ca88fc8208f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/f8df2c9a-1188-4c05-844d-14abeb900fce.png?resizew=134)
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解答题-作图题
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适中
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【推荐2】如图所示是用硬纸板做成的四个完全相同的直角三角形和一个边长为c的正方形,直角三角形两条直角边的长分别是a,b,斜边的长为c,请你将它们拼成一个能推导勾股定理的图形.
(1)画出拼成的这个图形的示意图;
(2)推导勾股定理.
(1)画出拼成的这个图形的示意图;
(2)推导勾股定理.
![](https://img.xkw.com/dksih/QBM/2018/7/27/1997580191989760/2003476981809152/STEM/4310ea50d5624ff58b629926a3d91c4c.png?resizew=302)
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