我国古代数学的许多创新和发展都位居世界前列,如南宋数学家杨辉(约13世纪)所著的《详解九章算法》一书中,用如图的三角形解释二项和
的展开式的各项系数,此三角形称为“杨辉三角”,据“杨辉三角”,设
的展开式中第三项的系数为
,
的展开式中第三项的系数
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
________ .
………………………….1
………………………..1 1
……………………1 2 1
……………………1 3 3 1
……………………1 4 6 4 1
……
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9216a0f9d6e65ea4937ab7bf102c5db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927cc54740d3992452ed79dd2d72c616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991293f2db453dccfdf21a1183e36954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f71b080549e246901c82cec35a8c095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe6379d05499ccdf2a76da95535f678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852e23a0022ffca4e65022de59697c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60971a2a1e1864bc363bf6920333f4d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc7b0b711d7b1c172a286624fa3f43b.png)
……
更新时间:2022-05-03 15:44:41
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【知识点】 运用完全平方公式进行运算解读