Question

identifica egalitatile adevarate
b) {1}\{2} = 0
f) {2,3,4}n○\ = {2,3,4}​

Answer 1

 

$\displaystyle\bf\\b)~~~\{1\}\setminus\{2\}=\{1\}-\{2\}=\{1\}\\\\Explicatie:\\Din~prima~multime~se~elimina~elementele~multimii~a~doua, dar\\multimile~sunt~disjuncte.~Nu~avem~ce~elimina.\\\\f)~~~\{2,~3~4\}~\bigcap~\varnothing=\varnothing.\\\\Explicatie:\\La~intersectie~luam~elementele~comune,~dar:\\1)~~\varnothing~nu~are~elemente\\2)~~\varnothing~este~submultime~a~oricarei~multimi.\\\implies~\varnothing \subset~\{2,~3,~4\}$