Răspuns:
[tex]5 \times ( {3}^{2002} - {3}^{2001} - {9}^{1000} ) = \\ 5 \times [ {3}^{2002} - {3}^{2001} - ( {3}^{2} ) ^{1000} ] = \\ 5 \times ( {3}^{2002} - {3}^{2001} - {3}^{2000} ) = \\ 5 \times {3}^{2000} \times ( {3}^{2} - 3 - 1) = \\ 5 \times {3}^{2000} \times 5 = \\ {3}^{2000} \times {5}^{2} = \\ ( {3}^{1000} \times 5) ^{2} \: \: \: \: \: -> patrat \: \: perfect[/tex]
sper că te-am ajutat!
