Question

Cum se rezolvă?
(7^10-7^9):(7^9-7^8)=

Answer 1

7^9(7-1): 7^8(7-1)= 7^9:7^8*6:6=7

Answer 2

$( 7^{10} - 7^{9}) :(7^{9} -7^{8} )= \\ =7^{9} (7^{1}-1 ):7^{8}(7^{1} -1) \\ =7^{9} :7^{8} \\ =7^{1} \\ =7$