tinh: B= (1/2)-(1/2^2)+(1/2^3)-(1/2^4)+...+(1/2^99)-(1/2^100)

Tinh tong  B =1 +1/2*(1 +2)*1/3*(1 +2+3)+....+1/100*(1+2+.....+100)

Anh chi nao biet thi nho giai giup em nga

cho bieu thuc a=-1/3+1/3^2-1/3^3+1/3^4-1/3^5+...+1/3^100 tinh gia tri cua bieu thuc b=4/a/+1/3^100

tinh B = 3+3/(1+2)+3/(1+2+3)+...+3/(1+2+3+...+100)

b, tinh 

(36 - 36/76^100 ) : (1/7 + 1/7^2 +1/7^3 + ... +1/7^100)

B=1/2+1/3+..+1/99+1/100 tren 99/1+98/2+..+2/98+1/99 

tinh nhanh

a) A= 33(1-2/3)(1-2/5)...(1-2/99)

b) B=101+100+99+98+...+3+2+1/101-100+99-98+...+3-2+1

c) C=423134x846267-423133/423133x846267+423134

Tinh: B=1/2+1/2²+1/2³+...+1/2¹⁰⁰

tinh tong

A=1+2+3+...+100

B=1/2+1/4+1/6+...+1/100

ai lam dung nhanh nhat se k