Найдите сумму 4/15+12/45 б)5/64+7/16 в)2/19+13/57 г)4/63+8/21 д)9/28+3/7 е)4/9+5/36

а) (4 * 3)/45 + 12/45 = (12 + 12)/45 = 24/45;
б) 5/64 + (7 * 4)/64 = (5 + 28)/64 = 33/64;
в) (2 * 3)/57 + 13/57 = (6 + 13)/57 = 19/57;
г) 4/63 + (8 * 3)/63 = (4 + 24)/63 = 2/63;
д) 9/28 + (3 * 4)/28 = (9 + 12)/28 = 21/28;
е) (4 * 4)/36 + 5/36 = (16 + 5)/36 = 21/36.