Evaluate :
(i) 37+−49+−117+79(ii) 23+−45+13+25(iii) 47+0+−89+−137+179(iv) 38+−512+37+312+−58+−27
Evaluate (i) {(13)−1−(14)−1}−1 (ii) (58)−7×(85)−4