Respostas

  • Usuário do Brainly
2013-05-27T01:35:45-03:00

Observe que:

 

\sqrt{28}=\sqrt{2^2\cdot7}=2\sqrt{7}

 

\sqrt{175}=\sqrt{5^2\cdot7}=5\sqrt{7}

 

\sqrt{63}=\sqrt{3^2\cdot7}=3\sqrt{7}

 

Logo:

 

\dfrac{\sqrt{28}}{\sqrt{26}}+\dfrac{\sqrt{175}}{\sqrt{63}}=\dfrac{2\sqrt{7}}{\sqrt{26}}+\dfrac{5\sqrt{7}}{3\sqrt{7}}=\dfrac{2\sqrt{7}}{\sqrt{26}}+\dfrac{5}{3}=\dfrac{6\sqrt{7}+5\sqrt{26}}{3\sqrt{26}}

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