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un ck de bomboane coasta31,2 lei cit vor costa 2,5kg de astfel de bomboane


Răspuns :

[tex]1kg.......31,2 lei \\ 2,5kg.......x \\\\\\ x=\frac{2,5*31,2}{1} \\\\ \boxed{x=78 \ lei}[/tex]
simplu   .............
2,5x31,2=78