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Cel mai inteligent răspuns!
2014-07-07T20:55:39+03:00
A = {-3, -6, -9.........-300}
B = {-4, -8, -12, ......-400}

 \frac{ S_{a} }{ S_{b}} =  \frac{3(-1 -2-3-......-100)}{4(-1 -2-3-......-100)} =  \frac{3}{4}


2 3 2