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1996年全国高考数学(文史类)第21题为:设等比数列{a_n}前n项和为S_n,若S_3+S_6=2S_9求数列的公比q。
In 1996, the 21st item of the national college entrance examination mathematics (literature and history) was: set the preceding n items of the equal number sequence {a_n} to be S_n, and if S_3+S_6=2S_9 the common ratio q of the series was obtained.