Răspuns :
[tex]\sqrt{56}-\sqrt{32}+\sqrt{72}-\sqrt{18}=2\sqrt{14} - 4\sqrt{2} + 6\sqrt{2} - 3\sqrt{2}=2\sqrt{14} - \sqrt{2}[/tex]
[tex]\sqrt{56}-\sqrt{32}+\sqrt{72}-\sqrt{18}=2\sqrt{14} - 4\sqrt{2} + 6\sqrt{2} - 3\sqrt{2}=2\sqrt{14} - \sqrt{2}[/tex]