[math](5+2 \sqrt{2}) \cdot \sqrt(33-20 \cdot \sqrt{2})[/math]
Portiamo sotto radice elevando al quadrato
[math]\sqrt{(5+2 \sqrt(2))^2 \cdot (33-20 \cdot \sqrt(2))}[/math]
[math]\sqrt{(25+8+20 \sqrt(2)) \cdot (33-20 \sqrt(2))}[/math]
[math]\sqrt{(33+20 \sqrt(2)) \cdot (33-20 \sqrt(2))}[/math]
[math]\sqrt{33^2 -400 \cdot 2}[/math]
[math]\sqrt{1089-800}[/math]
[math]\sqrt{289}[/math]
[math]17[/math]
