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设数列{a_nb_n}中{an}是等差数列(公差d≠0),{b_n}是等比数列(且公比q≠1),我们不妨称这类数列为积数列.记其前n项和为
Let {an_nb_n} be {an} an arithmetic series (tolerance d≠0) and {b_n} be an equal number (and the public ratio q≠1). We may call this series a product number column. Items and