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1. Efectuează: a) 24x56+76×12-728:13= 686:7+42 x 6-792:22 = b) 1 432 + (1 690-15 × 43) = 6 000-(40 x 13+56 x 9) = c) [(76 x 48) -(52 x 14)]: 10 = 2876-[(576:8)+(912:6)]=​