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(3^{11} + 3^{10} + 3^{9} ):39

Răspuns :

Răspuns:

3⁹(3²+3¹+1):39

3⁹(9+3+1):39

3⁹•13:39

3⁹•13/39

3⁹/3 ==> 3⁹:3¹=3^9-1=3⁸