Выполните действие 5-2\7;2)21+8\17;3)12-7\12;4)26\27+8
1) 5 -2/7 = 4 7/7 - 2/7 = 4 7-2/7 = 4 5/7 2) 21 +8/17 = 21 8/17 3)12 - 7/12 = 11 12/12 - 7/12 = 11 12-7/12 = 11 5/12 4)26/27 +8 = 8 26/27