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Radical din 20 plus radical din 45plus radical din 5


Răspuns :

 

[tex]\displaystyle\bf\\\sqrt{20}+\sqrt{45}+\sqrt{5}=\\\\=\sqrt{4\times5}+\sqrt{9\times5}+\sqrt{5}=\\\\=2\sqrt{5}+3\sqrt{5}+\sqrt{5}=\boxed{\bf6\sqrt{5}}[/tex]