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Consideram numerele rationale a,b si c.Se stie ca a*b=[tex] 2 \frac{3}{7} si  a * c= - \frac{3}{14} [/tex]
a.Calculati a*(b+c) si a *(b-c)
b.Daca b+c=[tex] \frac{31}{7} [/tex],calculati a.