求和:(2+1/2)+(2^2+1/2^2)+(2^3+1/2^3)+…+(2^n+1/2^n)=大神们帮帮忙

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求和:(2+1/2)+(2^2+1/2^2)+(2^3+1/2^3)+…+(2^n+1/2^n)=大神们帮帮忙
x){+ #mC}#Mm 80+655,

求和:(2+1/2)+(2^2+1/2^2)+(2^3+1/2^3)+…+(2^n+1/2^n)=大神们帮帮忙
求和:(2+1/2)+(2^2+1/2^2)+(2^3+1/2^3)+…+(2^n+1/2^n)=大神们帮帮忙

求和:(2+1/2)+(2^2+1/2^2)+(2^3+1/2^3)+…+(2^n+1/2^n)=大神们帮帮忙
1/1-1/2 1/2-1/3 .1/n-1/(n 1)=1-1/(n 1)=n/(n 1)