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Calculati: 
a)[tex] \frac{2}{3} * \frac{1}{7} + \frac{2}{3} * \frac{5}{14}[/tex]
b) [tex]3* \frac{2}{7} +4* \frac{2}{7}[/tex]



Răspuns :

a) 2/3 × 1/7 + 2/3 × 5/14= 2)2/21 + 10/42 = 4/42 + 10/42 = 14/42 b) 3 × 2/7 + 4 × 2/7 = 6/7 + 8/7 = 14/7