Răspuns :
Răspuns:
[tex]\frac{49^{5} *( 7^{-2})^{4} }{7^{3}} =\frac{(7^{2}) ^{5} * (\frac{1}{7^{2}} )^{4} }{7^{3} } =\frac{7^{10} * \frac{1}{7^{8} } }{7^{3}} =\frac{7^{2} }{7^{3}} = \frac{1}{7}[/tex] ∈ Q
valoarea expresiei nu reprezinta un numar natural
Răspuns:
49^5 × (7-^2)^4 / 7^3 =
(7^2)^5 × (1/7^2)^4/7^3 =
7^10 × 1/7^8 / 7^3 =
7^2/7^3 =
1/7