名校
解题方法
1 . 三国时代吴国数学家赵爽所注《周髀算经》中给出了勾股定理的绝妙证明,左上面是赵爽的弦图及注文,弦图是一个以勾股形之弦为边的正方形,其面积称为弦实,图中包含四个全等的勾股形及一个小正方形,分别涂成红(朱)色及黄色,其面积称为朱实以及黄实,并且利用
勾
股
(股
勾)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2358000a4859eca52dde1327e803c6.png)
朱实
黄实
弦实,化简得勾
股![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
弦
,设勾股中勾股比为
,若向弦图内随机抛掷
颗图钉,则落在黄色图形内的图钉数大约为_______________ .![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94bfdb53117463d600b565c30e0f3e36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e461727449e22cdf9d0ba260952e56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468403b3eba9e40bfa36f464e927738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bfc339cf6dd66599db64fa3fa44e608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2358000a4859eca52dde1327e803c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f4aef8835b7507e467c4d7d61532fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4cd9a7068de096606d1ab991f5e6da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564b8d5e56d663f0703474b95a409b00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db20862b954cd1886f4765657a46d91c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3c7b2fb191ae29a355688cb15a7888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94bfdb53117463d600b565c30e0f3e36.png)
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421605929394176/2424103593893888/STEM/1c71b46fa1aa4ca4a64ba839a3f85361.png?resizew=149)
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