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Aratati ca numarul 6 la puterea 2018 se poate scrie ca suma a trei cuburi perfecte.....ajutor!!


Răspuns :

6^2018= 6^2016 *6²=(6^672)³ * 36= (1+8+27)*(6^672)³=
=1³ *(6^672)³+2³*(6^672)³+3³*(6^672)³=
 (6^672)³+(2*6^672)³+(3*6^672)³=a³+b³+c³, suma de 3 cuburi perfecte
as simple as that!!!

[tex]\it 6^{2018} = 6^2\cdot6^{2016} =36\cdot (6^{672})^3 = (1^3+2^3+3^3)\cdot (6^{672})^3 = \\\;\\ = (6^{672})^3 +(2\cdot 6^{672})^3 + (3\cdot 6^{672})^3 [/tex]