Ajutor! Am nevoie de rezolvare, nu doar raspunsul

Răspuns:
Explicație pas cu pas:
[(1/2 + 7/2) : 2 + 1/3]^2 : (1 - 2/9)
= (8/2 : 2 + 1/3)^2 : (9/9 - 2/9)
= (4 : 2 + 1/3)^2 : 7/9
= (2 + 1/3)^2 : 7/9
= (6/3 + 1/3)^2 : 7/9
= (7/3)^2 x 9/7
= 49/9 x 9/7
= 7