Question

Ile to 5/12 + 9/20 =
4/9 razy 3/8 =
4/21 : 3/14 =
3/5 : 4/7 =

Answer 1

5/12 + 9/20 = 25/60 + 27/60 = 52/60 = 26/30 = 13/15
4/9 * 3/8 = 1/3 * 1/2 = 1/6
4/21 : 3/14 = 4/21 * 14/3 = 4/3 * 2/3 = 8/9
3/5 : 4/7 = 3/5 * 7/4 = 21/20 = 1 1/20