Tính tổng G = 1 x 3/ 3 x 5 + 2 x 4 / 5 x 7 + 3 x5 / 7 x 9 + 4 x 6 / 9 x 11 +........+ ( n - 1 ) x ( n + 1) / ( 2n -1 ) x 2n + 1) + ....+ 99 x 101 / 199 x 201