resposta:
Resolução:
$\;\sqrt{\dfrac{8}{9}}\,=\,\dfrac{\sqrt{8}}{\sqrt{9}}\,=\,\dfrac{\sqrt{4\,\centerdot\,2}}{\sqrt{9}}\,$ $=\,\dfrac{\sqrt{4}\,\centerdot\,\sqrt{2}}{\sqrt{9}}\,=\,\dfrac{2\,\centerdot\,\sqrt{2}}{3}\,$
Resposta:
$\,\dfrac{2\sqrt{2}}{3}\,$
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