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f:R->R ,f (x)=x"-x+2=?

Răspuns :

X²-X+2=0
cALCULEZI   DETEMINANTUL Δ
Δ=b²-4ac=1²-4*2=1-8=-7,<0   
eCUATIA   NU   ADMITE   SOLUTII   REALE