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25 supra 100 *  x = 3

Răspuns :

[tex]\displaystyle \frac{25}{100} \cdot x=3 \\ \frac{25x}{100} =3 \\ 25x=3 \cdot 100 \\ 25x=300 \\ x= \frac{300}{25} \\ x=12[/tex]