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DETERMINATI MULTIMIILE:
A)   A={n APARTINE LUI N/ 13/4<12/3n +2<3}


Răspuns :

13/4<12/(3n+2)
13(3n+2)<12x4
39n+26<48
39n<48-26
39n<22
n<22/39

12/(3n+2)<3
12<3(3n+2)
12<39n+6
-39n<-12+6
-39n<-6     ·(-1)
n>6/39

A={7/39;8/39;9/39;10/39;.........20/39;21/39}