выполнте действия: 1) 6 89 - 3 12 + 3 112 =
2) 8 79 + 6 215 - 4,3=
3) ( 19 521 - 8 314 ) - 6 57 =
4) ( 19 - 8 78 ) - ( 4 56 - 2 89 ) =

1) 6 89 - 3 12 + 3 112 = 6 32/36 - 3 18/36 + 3 3/36 = 6 17/36

2) 8 79 + 6 215 - 4,3= 8 35/45 + 6 6/45 - 4,3 = 14 41/45 - 4 3/10 = 14 82/90 - 4 27/90 = 10 55/90 = 10 11/18

3) ( 19 521 - 8 314 ) - 6 57 = 19 10/42 - 8 9/42 - 6 30/42 = 4 13/42 

4) ( 19 - 8 78 ) - ( 4 56 - 2 89 ) = 10 1/8 - 4 5/6 + 2 8/9 = 10 9/72 - 4 60/72 + 2 64/72 = 8 13/72