[tex]\it 1)\ \ f:E\longrightarrow N\\ \\ E = mul\c{\it t}imea\ elevilor\ din\ clas\breve a;\\ \\ N= mul\c{\it t}imea\ numelor\ elevilor\ din\ catalogul\ clasei\\ \\ \\ 2)\ \ g:E\longrightarrow\ \{7,\ 8,\ 9\}\\ \\ E = mul\c{\it t}imea\ elevilor\ din\ clas\breve a;\\ \\ \{7,\ 8,\ 9\} = mul\c{\it t}imea\ notelor\ de\ la\ teza\ de\ matematic\breve a[/tex]
[tex]\it 3)\ \ d:P\longrightarrow M\\ \\ P = mul\c{\it t}imea\ planetelor\ sistemului\ solar;\\ \\ M=mul\c{\it t}imea\ distan\c{\it t}elor\ \ (\^{i}n\ metri)\ a\ planetelor\ fa\c{\it t}\breve a\ de\ Soare[/tex]
