Question

HELP 

CMR 7⁶+7⁵ - 7⁴ chia hết cho 55 

 

Answer 1

\(7^6+7^5-7^4=7^4\left(7^2+7-1\right)=55\cdot7^4⋮55^{đpcm}\)

Answer 2

7⁶+7⁵-7⁴=7⁴(7²+7-1)=7⁴*55 chia hết cho 55

=> đpcm

t i c k cho mk nha

Answer 3

=\(^{7^4.7^2+7^4.7-7^4}\)

= \(^{7^4}\). (49+7-1)

=\(^{7^4}\). 55 chia hết cho 55

Answer 4

\(7^4\left(7^2+7-1\right)=7^4.55M55\left(đpcm\right)\)