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[tex] \frac{4}{2+ \sqrt{2} } -5+2 \sqrt{2} [/tex]
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Răspuns :

[tex] \frac{4}{2+ \sqrt{2} }-5+2 \sqrt{2} (amplificam la fractie cu 2- \sqrt{2} ) =\ \textgreater \ \frac{8-4 \sqrt{2} }{2} -5+2 \sqrt{2} [/tex][tex]=4-4 \sqrt{2 } -5+2 \sqrt{2} =-1-2 \sqrt{2} [/tex]