A = 1/1 * 2 + 1/3 * 4 + ... + 1/999 * 1000; B = 1/501 * 1000 + 1/502 * 999 +...+ 1/999 * 502 + 1/1000 x* 501. Tính A/B

A = 1/1 x 2 + 1/3 x 4 + ... + 1/999 x 1000; B = 1/501 x 1000 + 1/502 x 999 +...+ 1/999 x 502 + 1/1000 x 501. Tính A/B