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

A=1/1x2 + 1/3x4 + ... + 1/999 x1000 ; B= 1/501x 1000 + 1/502x999 +...+ 1/999x 502 + 1/1000x501
Tính A/B