Răspuns :
4/rad 12 simplifici prin radical din 12 si obtii: 4*2 rad din 3 /12 simplifici prin 6 si obtii radical din 3 /2
1).....=(4 rad3)^2-3^2=48-9=39
2)...(4rad18 )^2-(3 rad8)^2=288-72=216
1).....=(4 rad3)^2-3^2=48-9=39
2)...(4rad18 )^2-(3 rad8)^2=288-72=216
[tex]\displaystyle \frac{4}{ \sqrt{12} } = \frac{4}{2 \sqrt{3} } = \frac{4 \sqrt{3} }{6} = \frac{2 \sqrt{3} }{3} \\ \\ (4 \sqrt{3} -3)(4 \sqrt{3} +3)=48-9=39 \\ \\ (4 \sqrt{18} +3 \sqrt{8} )(4 \sqrt{18} -3 \sqrt{8} )=288-72=216[/tex]