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daca x apartine N si 1,5x+2<11 atunci x apartine (..............)


Răspuns :

1,5x+2<11
1.5x<11-2
1,5x<9
x<9:1,5
x<6  (x apartine numerelor 0,1,2,3,4,5)
1,5x+2<11 
1,5x < 11-2
1,5x <9
x < 9:1,5
x< 6
x = { 0,1,2,3,4,5}