Efectuati folosind factor comun:
(7^10-7^9):(7^9-7^8)​


Răspuns :

Răspuns:

(7^10-7^9):(7^9-7^8)​=

7⁹(7-1):7⁸(7-1)=7⁹⁻⁸=7¹=7