Răspuns:
Explicație pas cu pas:
[tex]a)~\dfrac{a}{b}=\dfrac{2}{5}~=>~ \dfrac{a}{6*b}=\dfrac{2}{6*5}~=>~\dfrac{a}{6*b}=\dfrac{1}{3*5}~=>~\dfrac{a}{6b}=\dfrac{1}{15}\\b) ~\dfrac{a}{b}=\dfrac{2}{5}~=>~ \dfrac{5*a}{b}=\dfrac{5*2}{5}~=>~\dfrac{5a}{b}=\dfrac{2}{1}\\c)~\dfrac{a}{b}=\dfrac{2}{5}~=>~\dfrac{11*a}{11*b}=\dfrac{11*2}{11*5}~=>~\dfrac{11a}{11b}=\dfrac{2}{5}\\d)~\dfrac{a}{b}=\dfrac{2}{5}~=>~\dfrac{12a}{b}=\dfrac{12*2}{5}~=>~\dfrac{12a}{b}=\dfrac{24}{5}~=>~\dfrac{12a}{15b}=\dfrac{24}{15*5}~=>~\dfrac{12a}{15b}=\dfrac{8}{25}[/tex]
Aplicate proporții derivate....
