5, 6/55+3, 9/44-4, 7/22

5 6/55 + 3 9/44 - 4 7/22 = 281/55 + 141/44 - 95/22 ==

НОК(22, 44, 55) = ?
22 = 2 * 11
44 = 2 * 22 = 2 * 2 * 11
55 = 5 * 11

НОК(22, 44, 55) = 5 * 11 * 2 * 2 = 4 * 5 * 11 = 20 * 11 = 220

== 1124/220 + 705/220 - 920/220 = (1124 + 705 - 920)/220 = (1829 - 920)/220 = 909/220 = 4 29/220

Ответ: 4 29/220