[tex](- \frac{7}{10} ):(+ \frac{14}{15})-(- \frac{1}{30}) [/tex]·[tex] \frac{5}{2} [/tex]=[tex]- \frac{7}{10} [/tex]·[tex] \frac{15}{14}+ \frac{1}{30}* \frac{5}{2}=[/tex]
se simplifica in prima 14 si 7 prin 7 si 10, 15 prin 5 si 10 si 14 prin 2, in a 2-a 30 si 5 prin
[tex]= \frac{1}{3}+ \frac{1}{12} =
[/tex]
se amplifica prima cu 4
[tex]= \frac{4}{12} + \frac{1}{12} = \frac{5}{12} [/tex]
