1) 4 2/5 + 1 1/7 = 22/5 + 8/7 = 154/35 +40/35 = 194/35
2) 2 8/13 + 3 2/3 = 34/13 + 11/3 = 102/39 + 143/39 = 245/39
3) 194/35 * 245/39 = 194/1 * 7/39 = 1358/39
4) 144 - 256 = - 112
5) 1358/39 : (- 112) = - 1358/39 * 1/112 = - 97/39 * 1/8 = - 97/312 ответ