А) 7/8 - 1/12 = 21/24 - 2/24 = 19/24
Б) 11/14 + 5/21 = 33/42 + 10/42 = 43/42 = 1 1/42
В) 3 3/4 - 1 7/9 = 15/4 - 16/9 = (135 - 64) / 36 = 71/36 = 1 35/36
Г) 9 5/12 - (5/6 + 4 7/24)= 9 5/12 - (5/6 + 4 7/24)= 9 5/12 - (20/24 + 111/24)= 9 5/12 - 131/24= (108/12 + 5/12) - 131/24= 113/12 - 131/24= (226/24) - 131/24= 95/24= 3 23/24
А) 7/8 - 1/12 = 21/24 - 2/24 = 19/24
Б) 11/14 + 5/21 = 33/42 + 10/42 = 43/42 = 1 1/42
В) 3 3/4 - 1 7/9 = 15/4 - 16/9 = (135 - 64) / 36 = 71/36 = 1 35/36
Г) 9 5/12 - (5/6 + 4 7/24)
= 9 5/12 - (5/6 + 4 7/24)
= 9 5/12 - (20/24 + 111/24)
= 9 5/12 - 131/24
= (108/12 + 5/12) - 131/24
= 113/12 - 131/24
= (226/24) - 131/24
= 95/24
= 3 23/24