А) 3/5 + 13/45
Б) 9/16 + 11/24
В) 9/10+ 15/14

3/5 + 13/45 = 27/45 + 13/45 = 40/45 = 8/99/16 + 11/24 = 27/48 + 22/48 = 49/48 = 1 1/489/10+15/14 = 63/70 + 75/70 = 138/70 = 1 68/70 = 1 34/35

а) 27/45+13/45=40/45=8/9б) 27/48+22/48= 49/48= 1 1/48в) (65+75)/70= 138/70=69/35