👤

(7la puterea 13- 7 la puterea 12): (7 la puterea 12- 7 la puterea 11) 

Răspuns :

[tex]( 7^{13}-7 ^{12} ):(7 ^{12} -7 ^{11} )= \frac{7 ^{12}(7-1) }{7 ^{11}(7-1) } =7[/tex]