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[tex] \frac{ \sqrt{2} - \sqrt{7} }{ \sqrt{2} + \sqrt{7} } - \frac{ \sqrt{2} + \sqrt{7} }{ \sqrt{2} - \sqrt{7} }[/tex]
[tex] \frac{ \sqrt{2} - \sqrt{7} }{ \sqrt{2} + \sqrt{7} } - \frac{ \sqrt{2} + \sqrt{7} }{ \sqrt{2} - \sqrt{7} }[/tex]
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[(√2-√7)²-(√2+√7)²]/[(2+√7)(2-√7)]=(2-2√14+7-2-2√14-7)/(2-7)==(-4√14)/(-5)=0,8√14