已知:如图,以Rt
的三边为斜边分别向外作等腰直角三角形,若斜边AB=5,则图中阴影部分的面积为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2013/8/26/1573677310058496/1573677316284416/STEM/5821885229d342ac8747ca700bea368f.png?resizew=149)
更新时间:2016-12-05 18:37:36
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【推荐1】如图,在
中,
,点
在
边上,延长
至点
,使得
,连接
,若
,则
的长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c385bd86d24c32c8b7c2d19afeeab3db.png)
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【推荐2】第七届国际数学教育大会的会徽主题图案是由一连串如图所示的直角三角形演化而成的.且
.如果把图中的直角三角形继续画下去,那么
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/405c7294-9b36-418a-9052-567482283454.png?resizew=200)
(1)线段![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9fde3bb41aaa8d24a7b1b888eaa74b7.png)
_____________ ,线段![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1779df70ebf5bbd99f6eb39cb1afd5ca.png)
_____________
(2)线段
中,有______ 条线段的长度为无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45545015f610aa02ca8c5151f3a7c16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/405c7294-9b36-418a-9052-567482283454.png?resizew=200)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9fde3bb41aaa8d24a7b1b888eaa74b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1779df70ebf5bbd99f6eb39cb1afd5ca.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365dac239f3db3621457d4f4171f5195.png)
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