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Calculaţi: a) 3¹⁰¹:9⁵⁰. b) (3⁵⁷: 9²⁵.3¹⁰): 3¹⁵; c) 2×4×2⁴³-2⁴⁶ + [9⁷⁴: 3⁴³-(3¹⁵)⁶]⁰. Va rog dau coroana!