Fill in the blanks: (i) Additive inverse of -5/-12 = ............... . (ii) -5/-12 + its additive inverse = ............... . (iii) If a/b is the additive inverse of -c/d , then -c/d is the additive inverse of ............... . And, so a/b + (-c)/d = (-c)/d + a/b = ............... .