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Aflati x€N, astfel incat 1/3<2/x-1<8/3

Răspuns :

1/3<2/x-1<8/3
1/3<2/x-2<8/3     |+2
1/3+2<2/x<8/3+2
7/6<2/x<14/6     |/2
1.16<x<2.33
x=2 apartine N