【单选题】已知{a n }是以a(a>0)为首项以q(-1<q<0)为公比的等比数列,设 A= lim n→∞ ( a 1 + a 2 +…+ a n ) , B= lim n→∞ ( a 1 + a 2 + a 3 +…+ a 2n ) , C= lim n→∞ ( a 1 + a 3 + a 5 +…+ a 2n-1 ) , D= lim n→∞ ( a 2 + a 4 + a 6 +…+ a 2n )...
【简答题】Proudly reading my words, I glanced around the room, only to find my classmates bearing big smiles on their faces and tears in their eyes. Confused, I glanced toward my stone-faced teacher. Having no ...