在数列一章的数学中,我们经常会碰到用“图”、“阵”、“表”表示的数列,往往我们遇到问题利用这些会使问题简单、形象、直观,同学们更易于接受.笔者想借助栏目一角,谈谈利用数列“阵”来解决数列的一些问题,与读者探讨.引例问2009在第几行,左起第几个数.问题采用以下设置:①第六行,左起第四个数是多少?②第20行,左起第四个数是多少? In the maths of a series of chapters, we often encounter the series represented by “graph ”, “matrix ”, “table ”, and we often encounter problems using these will make the problem simple, visual and intuitive , Students are more receptive.I want to help part of the column, talk about the use of the array “array ” to solve some of the problems of the series, and the reader to explore .In 2009 asked in the first few lines, the number from the left. The following settings: ① sixth line, the fourth from the left is how much? ② line 20, the fourth from the left is what?