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7. Calculați

a) [3²×3³+2⁵⁴:2⁵²+(3⁵)⁴:3²⁰]:31

b) [3⁴⁸:3¹⁸+(2⁴)⁵+6²³:6¹³]:[(3⁵)²×(2²)⁵+3¹⁷×3¹³+(2⁵)⁴]

Va rog dau coroana!!​