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Cat face a x (57-13 x 4) =340?


Răspuns :

 a(57-13·4) =340
a(57-52)=340
5a=340
a=340:5
a=68
a×(57-13×4)=340
a×(57-52)=340
a×5=340
a=340:5
a=68

a=68

Verificare:
68×(57-13×4)=340
68×(57-52)=340
68×5=340
340=340