Вычислить 1-2/7; 4-1/16
1-2/7=7/7-2/7=5/7 4-1/16=3 16/16-1/16=3 15/16
1 - 2/7 = 7/7 - 2/7 = 5\7 4 - 1/16 = 1 + ( 16/16 - 1/16 ) = 1 + 15/16 = 1 15/16