Question

daca a·b = $\frac{2}{15}$ si a·c= $\frac{11}{75}$, calculati a· (b+c)

Answer 1

$a(b+c)=ab+ac=^{5)}\frac{2}{15}+\frac{11}{75}=\frac{10}{75}+\frac{11}{75}=\frac{21}{75}$