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Determină valoarea lui a din fiecare egalitate: a+(864-864:3):3=864 co ropes a+(515:5x3-324:3+3 x 28) = 532 a-(612:3+1228:4-1000:5×2) = 278 64 d) (635+749:7 +678:3) - (312:3+628:4+5 e) (30 000: 1000-1000 x 40:20:100+624:6) f) (114-63:9) + a-(1011-164 x 4)=66 a +(127x4-924:3): 4+ (248 x 3+244:4)= ) (3 x 239-48 x 6+831:3-742:7):3:a-A​