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arati ca nr n=3^2011+2×3^2010+3^2009+3^2008 este patratul unui nr natural

Răspuns :

=3^2008 (3^3+2×3^2+3+1)

=(3^1004)^2 (27+18+4)

=(3^1004)^2 ×49

=(3^1004)^2 ×7^2

=(3^1004 ×7)^2 deci e pătrat perfect