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A=2 la puterea 1990-2 la puterea 1989-2 la puterea 1988


Răspuns :

A= 2 ^1990 - 2^1
A= 2^1989

[tex] {2}^{1990} - {2}^{1989} - {2}^{1988} = {2}^{1990} - {2}^{1} = {2}^{1989} [/tex]
Succes!!!!..........