Respostas

  • PeH
  • Ambicioso
2013-08-06T11:55:18-03:00
a) \ (-\frac{8}{5})^2 = -\frac{8}{5} \cdot (-\frac{8}{5}) = \frac{8^2}{5^2} = \frac{64}{25} = 2,56 \\\\ b) \ (-\frac{7}{5}) \cdot (-\frac{1}{5}) = \frac{7}{25} = 0,28 \\\\ c) \ \frac{3}{4} \cdot (-8) = -\frac{24}{4} = 6 \\\\ d) \ (-\frac{1}{5})^2 : \frac{2}{6} = \frac{1^2}{5^2} : \frac{1}{3} = \frac{1}{25} \cdot 3 = \frac{3}{25} = 0,12
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valeu ai hó cara me ajudo e muitu!