1) 7/15 + 2/15 = (7+2)/15 = 9/15 = 3/5
2) 37/46 - 21/46 = (37-21)/46 = 16/46 = 8/23
3) 5 17/36 + 3 7/36 = 8 (17+7)/36 = 8 24/36 = 8 2/3
4) 17 53/63 - 9 32/63 = 8 (53-32)/63 = 8 21/63 = 8 1/3
ответ: 1) 3/5 ; 2) 8/23 ; 3) 8 2/3 ; 4) 8 1/3
