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ionut cheltuieste o suma de bani astfel prima data 2 supra 5 din suma, a doua oara 5 supra 6 din rest, ramanandu i 5 lei. Ce suma a avut/

Răspuns :

[tex]x- \frac{2}{5} *x- \frac{5}{6} *(x- \frac{2}{5} *x)=5\\ \frac{3}{5} *x- \frac{5}{6} * \frac{3}{5} *x=5\\ \frac{3}{5} *x- \frac{1}{2} *x=5|*10\\6*x-5*x=50\\x=50[/tex]