Răspuns:
[tex] \frac{7}{10 } + \frac{4}{15 =} = apmlificam \: prima \: fractie \: cu \: 3 \: iar \: a \: doua \: cu \: 2 \ \\ \frac{21}{30} + \frac{8}{30} = \frac{29}{30} \\ \\ \\ \: d = \frac{10}{9} + \frac{1}{12} = \frac{40}{36} + \frac{2}{36} = \frac{42}{36} = \: prin \: simplificarea \:cu \: 2 \: vom \: ajunge \: la \: \frac{21}{18} [/tex]
