Reiskiniu prastinimas ir tapatybes irodymas

1. Suprastinti reiskini
[tex]\sqrt{7-3\sqrt{5}} - \sqrt{3+\sqrt{5}} \cdot (2-\sqrt{5})[/tex]


6. Irodyti tapatybe
[tex]\sqrt{12-6\sqrt{3}} + \sqrt{3} = 3[/tex]

[tex]\sqrt{12-6\sqrt{3}}= 3-\sqrt{3}[/tex]
[tex]12-6\sqrt{3}= 9-6\sqrt{3}+3[/tex]
[tex]12-6\sqrt{3}= 12-6\sqrt{3}[/tex]