So sánh

bai 1 so sanh a 81/63 54/36 b 7/10 63/90 c 11/27 3/13 d 5/7 7/11 e 19/9 38/12 f 3/4 27/36 g 4/5 8/9 h 10/14 15/21 i 6/15 8/20