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3la puterea 18 +3la puterea 17=4la puterea 1×3la puterea 17

Răspuns :

3¹⁸ + 3¹⁷ = 4¹ x 3¹⁷  <=>

3¹⁸ + 3¹⁷ = 3¹⁷· (3+1) = 4 x 3¹⁷ , corect