1 1

плюс —

4 3

Ответы:

1/4 + 1/3 = 7/12

2 2/17 + 3 2/5 * 15/17 = 36/17 + 17/5* 15/17 = 36/17 + 3 = 5 2/17

2 1/4 * 2/9 =1/2=0,5