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1258-3×(490:(52+18)×12, 30×18:(5371-(50×80+1461):2, a+93+42:7=130, 947-13×b+43=639, 3×(16×c-381)=537 pls help​

Răspuns :

Răspuns:

b=13+43=56(b) 13×56+43=639 c=16×381