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Se da functia f:R->R,f(x) =3/2x-0,5
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Răspuns :

A€Gf <=>f(-1)=-2

3/2×(-1)-5/10=-3/2-5/10=-15/10-5/10=-20/10=-2

deci A apartine Gf

B€Gf<=>f(5)=7

3/2×5-5/10=15/2-5/10=75/10-5/10=70/10=7

deci B apartine Gf