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Elenaturcan78
a fost răspuns

Rezolvati in N ecuatiile:11+22+33+...+88-2x=x+12

Răspuns :

11+22+33+...+88-2x=x+12; 11(1+2+...+8)-2x=x+12; 11•8•9/2=3x+12; 396=3x+12; 3x=384; x=128.