ai lam dc bai phuc bai phuc !

H

hoangsy007

Bai nay kho nhi ! Nhung kho doi voi ban thoi con minh thi kho6ng kho lam dau 1 minh giai nak . Ta co - (1+1/b)*(1+1/b+...+n)=1(1/a+...+b) dua cach nay vao bai toan ta co : 1 cong (1/2*...*100) Tinh 2 nhan 100 la duoc minh khong the tinh 2 nhan den 100 duoc vi mat may tinh roi ban tinh tong xich ma ra la duoc .
 
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