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Fie:a= \frac{2}{3} + \frac{1}{2} ; b=1 -\frac{1}{3} ;c \frac{1}{3} + \frac{4}{9} Aratati ca a*b=c

Răspuns :

[tex]\displaystyle a= \frac{2}{3} + \frac{1}{2} = \frac{4+3}{6} = \frac{7}{6} \\ \\ b=1 -\frac{1}{3}= \frac{3-1}{3} = \frac{2}{3} \\ \\ c= \frac{1}{3} + \frac{4}{9} = \frac{3+4}{9} = \frac{7}{9} \\ \\ a \cdot b= \frac{7}{6} \cdot \frac{2}{3} = \frac{14}{18} = \frac{7}{9} [/tex]