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Autentificare


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Clasa a VIII-a

Operaţii cu numere reale.

Fie

\[ E=\dfrac {5} {\sqrt {2}+\sqrt {18}}+\dfrac {3} {\sqrt {2}-\sqrt {18}}.\]

Scrie numărul E sub forma

\[ \large a\sqrt{b},\]

 unde a este o fracţie ireductibilă, iar b este un număr întreg.

 

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