Respostas

2014-04-11T12:26:03-03:00
2014-04-11T12:40:55-03:00
Olá, Saralinepop.

 \frac{-4}{5} * \frac{-7}{2} =  \frac{-4*-7}{5*2}  =  \frac{28}{10}

Podemos simplificar por 2:

 \frac{28}{10} =  \frac{14}{5} = 2,8
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