Răspuns: a) rationale: [tex]-\frac{10}{11}[/tex]; [tex]-\frac{5}{9}[/tex]; [tex]\sqrt{1,44}[/tex]; 21; [tex]-\sqrt{81}[/tex]; 17,82; 0; -2,(6) ; [tex]\sqrt{0,(4)}[/tex].
b) irationale: [tex]\frac{2}{\sqrt{3} }[/tex] ;[tex]-\sqrt{33}[/tex] ;[tex]\sqrt{12}[/tex].
c) reale pozitive: [tex]\frac{2}{\sqrt{3} }[/tex]; [tex]\sqrt{1,44}[/tex]; [tex]\\ 21[/tex]; [tex]\sqrt{12}[/tex]; 17,82; [tex]\sqrt{0,(4)}[/tex]
d) irationale negative: [tex]-\sqrt{33}[/tex]
