помагите пж найдите значения суммы и разности

1)

7 11/12 + 4 9/16 = 7 44/48 + 4 27/48 = 11 71/48 = 12 23/48,

7 11/12 - 4 9/16 =  7 44/48 - 4 27/48 = 3 17/48,

2)

25 13/42 + 19 9/14 = 25 13/42 + 19 27/42 = 44 40/42 = 44 20/21,

25 13/42 - 19 9/14 = 25 13/42 - 19 27/42 = 24 55/42 - 19 27/42= 5 28/42= 5 2/3,

3)

5 7/30 + 3 11/18 = 5 21/90 + 3 55/90 = 8 76/90 = 8 38/45,

5 7/30 - 3 11/18 = 5 21/90 - 3 55/90 = 4 111/90 - 3 55/90 = 1 56/90 = 1 28/45,

4)

49 3/20 + 38 1/12 = 49 9/60 + 38 5/60 = 87 14/60 = 87 7/30,

49 3/20 - 38 1/12 = 49 9/60 - 38 5/60 = 11 4/60 = 11 1/15