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DAU COROANA PRIMULUI RASPUNS CORECT CU TOT CU CALCUL
[tex]( \frac{1}{ \sqrt{2} } +1) (LA 2) +( \frac{1}{ \sqrt{2} } -1) (LA 2) - \frac{1}{2}

[/tex]

Răspuns :

[tex]\left(\dfrac{1}{\sqrt2}+1\right)^2 + \left(\dfrac{1}{\sqrt2}-1\right)^2 -\dfrac{1}{2}= \\\;\\ =\dfrac{1}{2} +2\cdot\dfrac{1}{\sqrt2} +1+\dfrac{1}{2} -2\cdot\dfrac{1}{\sqrt2} +1 -\dfrac{1}{2} =2\dfrac{1}{2} \\\;\\ .[/tex]

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