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2014-07-27T17:44:10-03:00
A )

 \sqrt{64}~\to~ \sqrt{8^2}~\to~8

b )

 \sqrt{0,64} ~\to~ \sqrt{ \frac{64}{100} } ~\to~ \frac{8^{\div2}}{10^{\div2}} ~\to~ \frac{4}{5}

c )

 \sqrt{0,0064} ~\to~ \sqrt{ \frac{64}{10000} } ~\to~ \frac{8}{100} ~\to~ \frac{4}{25}

d )

 \sqrt{640000} ~\to~ \sqrt{64*10000} ~\to~ \sqrt{8^2}* \sqrt{10^4}  ~\to~8*100 ~\to~800

e )

 \sqrt{ \frac{81}{144} } ~\to~ \frac{ \sqrt{81} }{ \sqrt{144} } ~\to~ \frac{9}{12} ~\to~ \frac{3}{4}

f )

 \sqrt{1,21} ~\to~ \sqrt{ \frac{121}{100} } ~\to~ \frac{11}{10}
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