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题目有两个等差数列{an}、{bn},若有传统解法设数列{an}、{bn}的前n项和分别为Sn、Sn′．则此法需要良好的预见能力和较强的目标意识,应用等差数列的性质步步配凑,技巧性较强,初学者往往有一种惊奇而又难以料想的
The title has two arithmetic sequences {an} and {bn}. If there is a traditional solution, the first n items of {an} and {bn} are Sn and Sn’. This method requires good foresight and a strong sense of purpose. Applying the nature of the difference series is a step-by-step process. Skills are strong. Beginners often have a surprise and unimaginable