Решите дроби 2/5+7/15 2/5+9/10 2/5+3/8 2/5+1 1/5 2/5+2/9

1) 13/15
2) 13/10
3) 31/40
4) 13/5
5) 28/45

2/5 + 7/15 = 6/15 + 7/15 = 13/15
2/5 + 9/10 = 4/10 + 9/10 = 13/10 = 1 3/10
2/5 + 3/8 = 16/40 + 15/40 = 31/40
2/5 + 11/5 = 13/5 = 2 3/5
2/5 + 2/9 = 18/45 + 10/45 = 28/45