Răspuns :
3. a)... A U B = [-2;6)
b)... diagonala cubului=10√3=[tex]\sqrt{l^2+l^2+l^2}=l\sqrt3[/tex]
⇒ l=10 cm deci [tex]A_l=4\,x\,10^2=400\,cm^2[/tex]
Pentru a)... _A________[-2__-1__0__.__.__.__.__5]__6___________
B [ )
AUB = [-2 6)
b)... diagonala cubului=10√3=[tex]\sqrt{l^2+l^2+l^2}=l\sqrt3[/tex]
⇒ l=10 cm deci [tex]A_l=4\,x\,10^2=400\,cm^2[/tex]
Pentru a)... _A________[-2__-1__0__.__.__.__.__5]__6___________
B [ )
AUB = [-2 6)