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Daca p=[tex]( \sqrt{5} + \sqrt{2} ) ^{2} - \sqrt{2} ( \sqrt{5} + \sqrt{2})- \sqrt{5}( \sqrt{2} - 2\sqrt{5} )[/tex] atunci aratati ca p ∈ N . Help me :o3

Răspuns :

p=(5+2+2√10) -√10-2-√10+2.5=7+2√10-2√10+8=15∈N