Respuesta :

1) 1/2

2) 3/7
that is the answer
6/12 = 1/2 (6 ÷ 6 = 1 and 12 ÷ 6 = 2)
18/21 = 6/7 (18 ÷ 3 = 6 and 21 ÷ 3 = 7)