-543+458=
0,54+(-0,83)=
- 2 5/7 +3=
- 2/9+(-5/6)=
2 9/11 + ( - 3 7/22)=

-543+458= -85-2 5/7 + 3= 40/7-2/9 + ( -5/6) = - 28/54

-543 + 358 = -(543 - 458) = -850,54 + (-0,83) = 0,54 - 0,83 = -0,29-2 5/7 + 3 = -19/7 + 3 = 2/7 -2/9 + (-5/6) = 2/9 - 5/6 = -11/182 9/11 + (-3 7/22) = 31/11 - 3 7/22 = 31/11 - 73/22 = -1/2