913/18 - 2 7/9; 5 8/15 - 4 23/30; 5 11/ 15 - 5 2/5 вычислите! с !

9 13/18 - 2 7/9 = 175/18 - 25/9 = 175/18 - 50/18 = 125/18 = 6  17/18
5 8/15 - 4 23/30 = 5 16/30 - 4 23/30 = 166/30 - 143/30 = 23/30
5  11/15 - 5  2/5 = 5 11/15 - 5 6/15 = 5/15 = 1/3