Respostas

2014-04-10T12:04:36-03:00
Vamos lá:

Questão 1:
a) 
[\frac{5}{7}]^{-2} = [\frac{7}{5}]^{2}  = \frac{7^{2}}{5^{2}} = \frac{49}{25} = 1,96
b) [ \frac{2}{5} ]^{-3} = [ \frac{5}{2} ]^{3} = \frac{25}{4} = 6,25
c) 7^{-2} = \frac{1}{7^{2}} = \frac{1}{49} = 0,02
d) [ -\frac{1}{2} ]^{6} =  - \frac{1^{6}}{2^{6}}  = + \frac{1}{64}

Questão 6:
a) 
 \sqrt[18]{36} = 36^{\frac{1}{18}} = 2^{\frac{1}{9}}.3^{\frac{1}{9}} = \sqrt[9]{6}
b)  \sqrt[4]{32} =  \sqrt[4]{2^{4} .  2}   =  2 \sqrt{2}

Questão 7:
a) 
 \sqrt[7]{10} = 10^{\frac{1}{7}}
b)  \frac{ \sqrt{10} }{ \sqrt{2} } =   \sqrt{5} = 5^{\frac{1}{2}}
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