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Aratati ca (1-1/3)la puterea a doua +5/9= 1

Răspuns :

(1 - 1/3)^2 + 5/9 =

= (3/3 - 1/3)^2 + 5/9 =

= (2/3)^2 + 5/9 =

= 4/9 + 5/9 =

= (4+5)/9 =

= 9/9 =

= 1

^ = putere