Question

tinh nhanh

H=2^2/3x3^2/8x4^2/15x5^2/24....9^2/80

Answer 1

lam tinh nhanh nhu the nao cac ban oi

ngay 26/3/2016 la tui phai nap cho co giao rui

no cac ban jup mih giai bai cho mau mau