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adevarat sau fals f: R*-->R*, f(x)=-7 pe x
A(O saptime,49) Э Gf.


Răspuns :

f(x)=-7/x
A(1/7, 49)∈Gf daca f(1/7)=49
f(1/7)=-7/1/7=-49 deci A∉Gf