3. Ştiind că: a = (5 + 7:7 + 2 – 2 : 2) × 2; b = [666 : 6 + 15: (35:7 – 28 : 7) – 1]: 5 - 5;
C = 7+ 3 x [2 – 3: (5 x 5 - 99: 9 x 2), calculaţi a+2xb-c
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