1)a) 5/12 + 7/8 = (52)/(122) + 7/8 = 10/24 + 21/24 = 31/24
б) 1 7/9 + 2 2/3 = 1 + 2 + 7/9 + 2/3 = 3 + 63/9 + 6/9 = 3 + 69/9 = 3 7/9
2)a) 5/6 - 9/14 = (57)/(67) - 9/14 = 35/42 - 9/14 = 35/42 - 27/42 = 8/42 = 4/21
б) 4 7/15 - 2 11/20 = 4 - 2 + 7/15 - 11/20 = 2 + 28/60 - 33/60 = 2 - 5/60 = 1 55/60 = 1 11/12
1)
a) 5/12 + 7/8 = (52)/(122) + 7/8 = 10/24 + 21/24 = 31/24
б) 1 7/9 + 2 2/3 = 1 + 2 + 7/9 + 2/3 = 3 + 63/9 + 6/9 = 3 + 69/9 = 3 7/9
2)
a) 5/6 - 9/14 = (57)/(67) - 9/14 = 35/42 - 9/14 = 35/42 - 27/42 = 8/42 = 4/21
б) 4 7/15 - 2 11/20 = 4 - 2 + 7/15 - 11/20 = 2 + 28/60 - 33/60 = 2 - 5/60 = 1 55/60 = 1 11/12