Răspuns :
2·15 = 3·10 => 2/10 = 3/15
7·12 = 4·21 => 7/21 = 4/12
5·42 = 6·35 => 5/35 = 6/42
8·65 = 13·40 => 8/40 = 13/65
9·20 = 12·15 => 9/12 = 15/20
6·49 = 21·14 => 6/21 = 14/49
7·12 = 4·21 => 7/21 = 4/12
5·42 = 6·35 => 5/35 = 6/42
8·65 = 13·40 => 8/40 = 13/65
9·20 = 12·15 => 9/12 = 15/20
6·49 = 21·14 => 6/21 = 14/49