446. Выполните действия: 1) 3 1/8 - (4 5/16 + 1 1/4); 2) -7 3/5 - (-4 1/15 - 5 2/3); 3) -3 1/2 - (5 3/4 + 2 7/20); 4) -1/3 - (-3 7/18 - 5 8/9).​

Ответ:

3 1/8 - (4 5/16 + 1 1/4) = 3 1/8 - (4 21/16 + 5/4) = 3 1/8 - (69/16 + 5/4) = 3 1/8 - (69/16 + 20/16) = 3 1/8 - 89/16 = -5 9/16

-7 3/5 - (-4 1/15 - 5 2/3) = -7 3/5 + (4 1/15 + 5 2/3) = -7 3/5 + (4 1/15 + 32/3) = -7 3/5 + (4 1/15 + 160/15) = -7 3/5 + 4 11/15 = -2 8/15

-3 1/2 - (5 3/4 + 2 7/20) = -3 1/2 - (5 15/20 + 2 7/20) = -3 1/2 - (5 22/20) = -3 1/2 - (5 11/10) = -8 6/5

-1/3 - (-3 7/18 - 5 8/9) = -1/3 + (3 7/18 + 5 8/9) = -1/3 + (3 14/36 + 5 16/18) = -1/3 + (3 7/18 + 5 8/9) = -1/3 + (3 14/36 + 20 16/36) = -1/3 + 23/6 = -19/18