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Exerciţii şi probler 1. Calculează! a) 28 x 34 = 285 ×9= 104 x 7 = b) (5+5x5) x5-5+5x5 2x [35+2x (500 - 398)] - 428 279 +9x [27+27 x (27-9x0) +9]+9-7​