5. Efectuați calculele:

Răspuns:
Explicație pas cu pas:
a) 1/5 + (- 1/5) = 1/5 - 1/5 = 0
b) - 7/3 - (+ 5/3) = - 7/3 - 5/3 = - 12/3 = - 4
c) 11/4 - (- 1/4) = 11/4 + 1/4 = 12/4 = 3
d) + 1/3 - (+ 4/3) = 1/3 - 4/3 = - 3/3 = - 1
e) - 2/5 - (- 7/5) = - 2/5 + 7/5 = 5/5 = 1
f) 4/3 + (- 1/3) = 4/3 - 1/3 = 3/3 = 1