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Calculaţi: a) [9²49-(5²-3-2¹+7)]: 3%; c) [723 (1 +7° +5³:25)]: 722; 15. Calculati b) 10² [(2²42): 12 +3³:3]; d) [2° +2¹43¹4; (3-3): 32,
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