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Efectuati calculele:

(2-radical din5)la puterea a 2


Răspuns :

[tex] (2-\sqrt{5} ) ^{2} = 2^{2} -2x2x \sqrt{5}+ (\sqrt{5}) ^{2} =4- 4\sqrt{5} + 5=9-4\sqrt{5}[/tex]