а) 1/2 - 1/4 + 2/5 = 5/10 - 2/10 + 4/10 = 7/10б) 3/4 - 1/2 + 7/8 = 6/8 - 4/8 + 7/8 = 9/8в) 1/3 - 1/9 + 1/6 = 2/6 - 1/6 + 3/6 = 4/6 = 2/3г) 5/6 - 2/3 + 1/4 = 10/12 - 8/12 + 3/12 = 5/12
а) 1/2 - 1/4 + 2/5 = 5/10 - 2/10 + 4/10 = 7/10
б) 3/4 - 1/2 + 7/8 = 6/8 - 4/8 + 7/8 = 9/8
в) 1/3 - 1/9 + 1/6 = 2/6 - 1/6 + 3/6 = 4/6 = 2/3
г) 5/6 - 2/3 + 1/4 = 10/12 - 8/12 + 3/12 = 5/12