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Acvcosmin
a fost răspuns

n²+3n+2    apartine N
   n+1

Răspuns :

Deva
n²+3n+2/n+1=(n+1)²+(n+1)/n+1=(n+1)(n+1+1)/n+1=(n+1)(n+2)/n+1=n+2
n∈N,n∈{0,1,2,3...}

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