Найдите значение выражения О. 7ц 5/18-3ц 2/27-11/54 С. 8ц 7/12-4ц 5/18-1ц 1/4 У. 9ц 3/20-2ц 3/25-4 Г. 5ц 11/42-2ц 3/14-1ц 1/21 Л. 13-5ц 7/12-1ц 4/15 Б. 11-6ц 13/21-3/14 ц-целых

Вычислим значения выражений: 

O) 7  5/18 - 3  2/27 - 11/54  = 7 - 3 + (5/18 - 2/27 - 11/54) = 4 + 15/54 - 4/54 - 11/54 = 4 + (15 - 4 - 11)/54 = 4 + 0/54 = 4; 

C) 8 7/12 - 4  5/18 - 1 1/4 = 8 - 4 - 1 + 7/12 - 5/18 - 1/4 = 3 + 21/36 - 10/36 - 9/36 = 3 + (21 - 10 - 9)/36 = 3 + (11 - 9)/36 = 3 2/36 = 3 1/18; 

У)  9  3/20 - 2  3/25 - 4 = 9 - 2 - 4 + 3/20 - 3/25 = 3 + 15/100 - 12/100 = 3 3/100; 

Г) 5 11/42 - 2 3/14 - 1 1/21 = 5 - 2 - 1 + 11/42 - 3/14 - 1/21 = 2 + 11/42 - 9/42 - 2/42 = 2 + 2/42 - 2/42 = 2; 

Л) 13 - 5 7/12 - 1 4/15 = 13 - 5 - 1 - 7/12 - 4/15 = 7 - 35/60 - 16/60 = 6 + 60/60 - 35/60 - 16/60 = 6 + 25/60 - 16/60 = 6 9/60 = 6 3/20; 

Б) 11 - 6 13/21 - 3/14 =  11 - 6 - 13/21 - 3/14 = 5 - 26/42 - 9/42 = 4 + 42/42 - 26/42 - 9/42 = 4 + 16/42 - 9/42 = 4 7/42.