а) 7/20 + 11/30 = 21/60 + 22/60 = 43/60
б) 19/60 - 8/45 = 57/180 - 32/180 = 25/180 = 5/36
в) 5/48 + 17/36 = 15/144 + 68/144 = 83/144
г) 11/30 - 16/45 = 33/90 - 32/90 = 1/90
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а) 7/20 + 11/30 = 21/60 + 22/60 = 43/60
б) 19/60 - 8/45 = 57/180 - 32/180 = 25/180 = 5/36
в) 5/48 + 17/36 = 15/144 + 68/144 = 83/144
г) 11/30 - 16/45 = 33/90 - 32/90 = 1/90