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Daca [tex]a*b= \frac{2}{15}[/tex] si [tex]a*c= \frac{11}{75} [/tex] , calculati a*(b+c)

Răspuns :

[tex]a*(b+c)=a*b+a*c= \frac{2}{15}+ \frac{11}{75}= \frac{10}{75}+ \frac{11}{75}= \frac{21}{75}= \frac{7}{25} [/tex]