Найдите значение выражения (8 1/42-12 4/21)-(5 1/42-3 3/7); 2)-19 7/16 - (25 5/8-28 1/2)-3/4

Пошаговое объяснение:

( 8 1/42 - 12 4/21) - ( 5 1/42 - 3 3/7)=- 5 16/21

1) 8 1/42 - 12 4/21 = 8 1/42 - 12 (4*2)/42= 8 1/42 - 12 8/42 = 7 43/42 - 12 8/42=- 4 7/42

2) 5 1/42 - 3 3/7 = 5 1/42 - 3 (3*6)/42 = 5 1/42 - 3  18/42 = 4 43/42 - 3 18/42=1  25/42

3) -4 7/42 - 1 25/42= -5 32/42= -5 16/21

-19 7/16 - ( 25 5/8 - 28 1/2) -3/4=- 17 5/16

1) 25 5/8 - 28 1/2 = 25 5/8 - 28 4/8= -2 7/8

2) -19 7/16 +2 7/8 = -19 7/16-+2 14/16= -16 9/16

3) - 16 9/16 - 3/4 = -16 9/16- 12/16= - 17 5/16