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运用三种方法,例析了一类已知两个等差数列前n项和的比值,求这两个数列里项的比值问题;剖析了比值的下标同与不同,需运用不同的解法,希望对读者有所帮助与启发.
Three kinds of methods are used to analyze the ratios of the first n terms of two known arithmetic sequences and find the ratio of the items in the two sequences. It is analyzed that the subscripts of the ratios are different from each other, and different solutions , I hope to help readers and inspiration.