Rasionalkan
A.
[tex]\sf{ \frac{3}{ \sqrt{2} \: - \: \sqrt{7} } = \frac{3}{ \sqrt{2} \: - \: \sqrt{7} } \times \frac{ \sqrt{2} + \sqrt{7} }{ \sqrt{2} + \sqrt{7} } }[/tex]
[tex]\sf{ \frac{3 \: ( \sqrt{2} + \sqrt{7} )}{( \sqrt{2} \: - \: \sqrt{7})( \sqrt{2} \: + \: \sqrt{7} ) } = \frac{3 \sqrt{2} \: + \: 3 \sqrt{7} }{( \sqrt{2 }) ^{2} \: - \: ( \sqrt{7})^{2} } }[/tex]
[tex]\sf{ \frac{3 \sqrt{2} \: + \: 3 \sqrt{7} }{2 \: - \: 7} = \frac{3 \sqrt{2} \: + \: 3 \sqrt{7} }{ - 5} }[/tex]
[tex]\blue{\boxed{\sf{ - \frac{3 \sqrt{2} \: + \: 3 \sqrt{7} }{5} }}}[/tex]
B.
[tex]\sf{ \frac{ \sqrt{7} }{ \sqrt{3} } = \frac{ \sqrt{7} }{ \sqrt{3} } \times \frac{ \sqrt{3} }{ \sqrt{3} } }[/tex]
[tex]\blue{\sf{ \frac{ \sqrt{21} }{3} \: atau \: \frac{1}{3} \sqrt{21} }}[/tex]
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