12.Oblicz:
a) 5/7 ÷ 3 =
6 ÷ 2 1/5 =
7 1/6 ÷ 9 =
b) 2/3 ÷ 3/5 =
3 3/7 ÷ 5/8 =
1 3/4 ÷ 1 3/5 =​