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【简答题】
已知等差数列 中,已知首相 ,公差 ( 1 )求等差数列 的通项公式 , 和 ; ( 2 )求等差数列 的前 20 项和 . ( 3 )在正项等比数列 中,已知 , ,求 等比数列 的公比 q .
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B.
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A.
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B.
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C.
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D.
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E.
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