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Mathematics, 30.03.2022 18:20 kobz

Help!!! Rationalize the denominator of;

$1) \frac{1}{ \sqrt{7} }$
$2) \frac{2}{ \sqrt{3} - \sqrt{2} }$
$3) \frac{ \sqrt{6} + \sqrt{3} }{9 + 2 \sqrt{18} }$

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