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arata ca numarul a=2^5-2^3-2^3-2^3 este cubul unui nr natural

Răspuns :


[tex] {2}^{5} - {2}^{3} - {2}^{3} - {2}^{3} = {2}^{3} ( {2}^{2} - 1 - 1 - 1) = {2}^{3} (4 - 1 - 1 - 1) = {2}^{3} (4 - 3) = {2}^{3} \times 1 = {2}^{3} [/tex]