а) 25/30 - 20/60 + 15/30 = 5/6 - 1/3 + 1/2 = 20/36 - 12/36 + 18/36 = 26/36 = 13/18б) 9/36 + 36/75 - 1/9 = 1/4 + 12/25 - 1/9 = 9/36 + 36/100 - 4/36 = 45/100 = 9/20в) 19/21 - 16/42 + 1/7 = 1 - 8/21 + 3/21 = 1 - 5/21 = 16/21г) 4/6 + 1/3 - 1/100 = 2/3 + 1/3 - 1/100 = 3/3 - 1/100 = 0.99
а) 25/30 - 20/60 + 15/30 = 5/6 - 1/3 + 1/2 = 20/36 - 12/36 + 18/36 = 26/36 = 13/18
б) 9/36 + 36/75 - 1/9 = 1/4 + 12/25 - 1/9 = 9/36 + 36/100 - 4/36 = 45/100 = 9/20
в) 19/21 - 16/42 + 1/7 = 1 - 8/21 + 3/21 = 1 - 5/21 = 16/21
г) 4/6 + 1/3 - 1/100 = 2/3 + 1/3 - 1/100 = 3/3 - 1/100 = 0.99