Răspuns:
Gigi = radical 6 - 1
Explicație pas cu pas:
[tex] \frac{x + y}{2} = \frac{ \sqrt{6} + \sqrt{5} + \sqrt{6} - \sqrt{5} }{ 2} = \frac{2 \sqrt{6} }{2} = \sqrt{6} [/tex]
[tex] \sqrt{x \times y} = \sqrt{( \sqrt{6} - \sqrt{5}) } \times ( \sqrt{6} + \sqrt{5} ) = \sqrt{6 - 5} = \sqrt{1} = 1[/tex]
[tex] \sqrt{6} - 1[/tex]
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