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8 radical 11-{5radical 13+radical 7-(5 radical 11-radical 13 +4radical7)}


va roog, dau coroana~!!!


Răspuns :

8v11-(5v13+v7-5v11+v13-4v7)=
=8v11-(6v13-3v7-5v11)
=8v11-6v13+3v7+5v11
=13v11-6v13+3v7