Respostas

2014-03-28T14:56:24-03:00
 \sqrt[9]{a 8^{3} } =  (a 8^{3} )^{ \frac{1}{9} } =  (a^{ \frac{1}{9} }) ( 8^{3} )^{ \frac{1}{9} }  =  \sqrt[9]{a} ( 8^{ \frac{1}{3} } ) =  \sqrt[9]{a}  \sqrt[3]{ 2^{3} }  =  2\sqrt[9]{a}

 \sqrt{ t^{7} } =   (t^{7})^{ \frac{1}{2} } =  t^{ \frac{7}{2} }

\sqrt[3]{48} = \sqrt[3]{ 2^{3} * 6} = 2 \sqrt[3]{6}

 \sqrt{ x^{12} } =  ( x^{12} )^{ \frac{1}{2}} =  x^{ \frac{12}{2} } =  x^{6}
Espero que esteja certo e que possa te ajudar! :D