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a) {x|x €N si 2 < x <5}U{x|x €N și x<7}
​REPEDE !


Răspuns :

3, 4, 6

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

{3,4}U{0,1,2,3,4,5,6}
={0,1,2,3,4,5,6}