Răspuns :
[tex]7.5 = \frac{75}{10} = \frac{15}{2} [/tex]
[tex]0.4 = \frac{4}{10} = \frac{2}{5} [/tex]
[tex]0.4 = \frac{4}{10} = \frac{2}{5} [/tex]
[tex] => \boxed{7,5=\dfrac{75}{10}^{:5}=\dfrac{15}{2} ; 0,4=\dfrac{4}{10}^{:2}=\dfrac{2}{5}}[/tex]