Задание 1.
а) 12 5/12 + 4 1/8 - 4 2/3 = 12 10/24 + 4 3/24 - 4 16/24 = 16 13/24 - 4 16/24 = 15 37/24 - 4 16/24 = 11 21/24 = 11 7/8
б) 5 9/10 + (5 - 2 8/15) = 5 9/10 + 2 7/15 = 5 27/30 + 2 14/30 = 7 41/30 = 8 11/30
Задание 2.
а) 12 - х = 1 1/9
х = 12 - 1 1/9
х = 10 8/9
б) 5 8/9 + х = 7 1/18
5 16/18 + х = 7 1/18
х = 7 1/18 - 5 16/18
х = 6 19/18 - 5 16/18
х = 1 3/18
х = 1 1/6