Question

Racionalize os denominadores

Answer 1

$\frac{4}{6 \sqrt{7} } = \frac{4}{ 6\sqrt{7} } . \frac{ \sqrt{7} }{ \sqrt{7} } = \frac{4 \sqrt{7} }{6. \sqrt{7} \sqrt{7} } = \frac{4 \sqrt{7} }{6.7} = \\ \frac{4 \sqrt{7} }{42} = \frac{2 \sqrt{7} }{21}$