Question

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Answer 1

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Вот ваше решение:

$frac{3-sqrt{3} }{sqrt{21}-sqrt{7}} = frac{(3-sqrt{3})(sqrt{21}+sqrt{7})}{(sqrt{21}-sqrt{7})(sqrt{21}+sqrt{7})} = frac{3sqrt{21}+3sqrt{7}-sqrt{63}-sqrt{21}}{21-7} =\\frac{3sqrt{21}+3sqrt{7}-3sqrt{7}-sqrt{21}}{14}} = frac{3sqrt{21}-sqrt{21}}{14} = \\frac{2sqrt{21}}{14} = frac{sqrt{21}}{7}$