Помогите решить 5 примеров пожалуйста

1)2 5/9 +4 1/6 = 2 10/18 +  4 3/18 = 6 13/18
2)3/4 + 2,6= 3/4 + 2 3/5 = 15/20 +2 12/20 = 2 27/20 = 3 7/20
3) 6 3/8 + 5 7/10 = 6 15/40 + 5 28/40 = 11 43/40 = 12 3/40
4)8 9/16 + (-14)= 8 9/16 - 13 16/16 = - 5 7/16
5)2 3/4 + ( - 4,25) = 2 3/4 - 4 1/4 = 2 3/4 - 3 5/4 = - 1 2/4 = - 1 1/2