Ответы и объяснения

2014-02-12T17:04:44+04:00
а) 3/5-1/4+1/3 = 36/60 - 15/60 + 20/60 = 41/60
б) 1/3-1/9+1/6 = 6/18 - 2/18 + 3/18 = 7/18
в) (2/3+1/9)-13/18 = 12/18 + 2/18 - 13/18 = 1/18