Dovedeste-mi ca numarul 9¹⁶+27¹¹ este patrat perfect

Răspuns:
[tex] {9}^{16} = ( {3}^{2} )^{16} = {3}^{32} [/tex]
[tex] {27}^{11} = ( {3}^{3} )^{11} = {3}^{33} [/tex]
[tex] {3}^{32} + {3}^{33} = {3}^{32} \times (1 + 3) = {3}^{32} \times {2}^{2} = (2 \times {3}^{16} )^{2} [/tex]
Adică, pătrat perfect.