Răspuns :
Răspuns:
- Problema 1: A = { 1, 2} și B = {0, 3, 4}
- Problema 2: card(E ∩ F) = 8
Explicație pas cu pas:
Salutare!
--- Problema 1 ---
[tex]\bf A \cup B = \{0,1,2,3,4\} \:\:\:\text{\it (relatia 1)}[/tex]
[tex]\bf A \cap\{1,2,3\} = \{1,2\}\implies \{1,2\}\subset A\:\:\text{\it (relatia 2)}[/tex]
[tex]\bf B \cap\{0,4,6\} = \{0,4\}\implies \{0,4\}\subset B\:\:\text{\it (relatia 3)}[/tex]
[tex]\text{\it Din (relatia 1) + (relatia 2) + (relatia 3) avem:}[/tex]
[tex]\boxed{\bf A = \{1,2\} }[/tex]
[tex]\boxed{\bf B = \{0,3,4\} }[/tex]
--- Problema 2 ---
[tex]\bf card (E \cup F) = 15[/tex]
[tex]\bf card (E \setminus F) = 6[/tex]
[tex]\bf card (F \setminus E) = 1[/tex]
[tex]\bf card (E \cap F) =???[/tex]
[tex]\bf card (E \cap F) = card (E \cup F) - [card (E\setminus F) + card (F\setminus E)][/tex]
[tex]\bf card (E\cap F) = 15 - (6 + 1)[/tex]
[tex]\bf card (E\cap F) = 15 - 7[/tex]
[tex]\boxed{\bf card (E\cap F) = 8}[/tex]
==pav38==