有一个面积为1的正方形,经过一次“生长”后,在它的左右肩上生出两个小正方形(如图1),其中,三个正方形围成的三角形是直角三角形,再经过一次“生长”后,生出了
个正方形(如图2),如果按此规律继续“生长”下去,那么它将变得“枝繁叶茂”.在“生长”了
次后形成的图形中所有正方形的面积和是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
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更新时间:2024-02-24 19:36:47
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【推荐1】如图,已知AB=AC,D为∠BAC的角平分线上的一点,连接BD,CD;如图2,已知AB=AC,D、E为∠BAC的角平分线上的两点,连接BD,CD,BE,CE;如图3,已知AB=AC,D、E、F为∠BAC的角平分线上的三点,连接BD,CD,BE,CE,BF,CF;…,依次规律,第5个图形中有全等三角形的对数是_____ .
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【推荐2】用火柴棒按如图所示的方式摆图形,按照这样的规律继续摆下去,第5个图形需要火柴棒 _____ 根,第n个图形需要火柴棒 __________ 根(用含n的代数式表示).
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【推荐1】
周髀算经
是中国最古老的天文学和数学著作,约成书于公元前
世纪.
周髀算经
中记载:“勾广三,股修四,经隅五”,意为:当直角三角形的两条直角边分别为3(勾)和4(股)时,径隅(弦)则为
,后人简单地把这个事实说成“勾三股四弦五”.观察下列勾股数:
,
,
;
,
,
;
,
,
;
,这类勾股数的特点是:勾为奇数,弦与股相差为
.柏拉图研究了勾为偶数,弦与股相差为
的一类勾股数,如:
,
,
;
,
,
;
,若某个此类勾股数的勾为
,则其弦是______ .
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【推荐1】如图,分别以
的三边为边向外作正方形,然后分别以三个正方形的中心为圆心,以正方形边长的一半为半径作圆,记三个圆的面积分别为
,
,
,若
,则
的形状为_____ 三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,直线l上摆有三个正方形a,b,c,若a、c的面积分别为8和10,则b的面积是__________ .
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