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這個問題是考察對等比數列公式的理解,一般的等比數列有Sn=a1(1-q^n)/(1-q),那麼化簡後發現常數項係數為a1/(1-q),後面那個為他的相反數,那個式子給的常數項係數為1,很顯然k應為-1,答案選B
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