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(2pe3)la puterea0+(2pe3)la puterea1+(2pe3)la puterea2

Răspuns :

(2/3)⁰ + (2/3)¹ + (2/3)² = 1 + 2/3 + 4/9 = (9 + 6 + 4) : 9 = 19/9.

/robertinni