数列1,(1+2),(1+2+2^2),...,(1+2+2^2+...+2^n-1+...)的前n项和是多少(要具体过程)
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数列1,(1+2),(1+2+2^2),...,(1+2+2^2+...+2^n-1+...)的前n项和是多少(要具体过程)
数列1,(1+2),(1+2+2^2),...,(1+2+2^2+...+2^n-1+...)的前n项和是多少(要具体过程)
数列1,(1+2),(1+2+2^2),...,(1+2+2^2+...+2^n-1+...)的前n项和是多少(要具体过程)
本来可为an=1*2^n的数列,Sn=2^n-1,所以这个数列前n项和Tn=-n+(2^n-1)*2