Question

exercitiile 9 si 10 va rog

Answer 1

9.

x€N

x=?

{2;3;x;9} = {2;3;7;9}

=> x=7

10. {-2,-1,x} - submultime a {-3,-2,-1,0,1,2,3}

x = ?

x€ {-3,-2,-1,0,1,2,3}/{-2,-1}

x€{-3,0,1,2,3}

Submultimile formate sunt:

{-3,-2,-1}, {-2,-1,0}, {-2,-1,1}, {-2,-1,2}, {-2,-1,3}