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fie a=5+7+9+...27 calculati radical a

Răspuns :


[tex]\it a = 5+7+9+\ ...\ +27 =1+3+5+7+\ ...\ +27-(1+3)=14^2-4=\\ \\=196-4=192\\ \\ \sqrt{192}=\sqrt{64\cdot3} =8\sqrt3[/tex]