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利用数阵解决某些特殊数列的项数或求和问题,关键是抓住问题中给出数阵的各行各列所构成数列的特征,再根据特殊项推出各行各列的前几项,进而求出通项或各项和,从而顺利地解决相关的问题.
The key is to use the number of arrays to solve the number of items or the sum of certain special series. The key is to seize the characteristics of the arrays of rows and columns given in the array. Then the first few items of each row and row are introduced according to the special items. Find the general term or item sum to successfully solve related problems.