1) 1/2 - (+4) = 1/2 - 4 = 1/2 - 8/2 = - 7/2 = - 3,5
2) - 5/11 - (- 5/11) = - 5/11 + 5/11 = 5/11 - 5/11 = 0
3) - 5 - (-2 1/3) = -5 + 2 1/3) = 2 1/3 - 5 = 7/3 - 5 = 7/3 - 15/3 = - 8/3 = -2 2/3
4) -8 - (-1/7) = -8 + 1/7 = 1/7 - 8 = 1/7 - 56/7 = -55/7 = -7 6/7
5) 1/6 - (+3) = 1/6 - 3 = 1/6 - 18/6 = - 17/6 = -2 5/6
6) -5/12 - (-4) = -5/12 + 4 = 4 - 5/12 = 3 12/12 - 5/12 = 3 7/12