problema GM 2/1999

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Al3xx
Euclid
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Joined: Fri Nov 07, 2008 10:39 pm
Location: Slatina

problema GM 2/1999

Post by Al3xx »

Fie \( x,y \in R \) astfel incat \( x(2x+y+1) + y(y+\frac{1}{2}) = 0 \).Sa se arate ca :

\( 2x+y \in \[-\frac{8}{7},0\]. \)
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