Question

Simplificînd fractia 7la puerea22- 7la puterea 21 \ 7la puterea 25- 7 la puterea 24 se obtine fractie ireductibila :
A : 1\7
B: 1\7 =7 la puterea 2
C: 1\7 =7 la puterea 3
D: 1\7=7 la puterea 4

Answer 1

$\frac{ 7^{22}- 7^{21} }{ 7^{25} - 7^{24} } = \frac{ 7^{22}(7-1) }{ 7^{24}(7-1) }= \frac{ 7^{22} }{ 7^{24} }= \frac{1}{7^2}$
Raspuns:B