( pierwiatek z trzech + 2 pierwiastki z dwóch ) (4 pierwiastki z trzech - 8 pierwiastków z dwóch ) = ? 

[latex](sqrt{3}+2sqrt{2})(4sqrt{3}-8sqrt{2})=sqrt{3}cdot4sqrt{3} +sqrt{3}cdot (-8sqrt{2})+2sqrt{2} cdot4sqrt{3}+2sqrt{2} cdot(-8sqrt{2})=\ 4cdot 3+(-8sqrt{6})+8sqrt{6} -16cdot 2=12-32=20[/latex]