P/s : mk làm phần b trước

\(6\cdot5^{22}=\left(5+1\right)\cdot5^{22}=5^{23}+5^{22}>5^{23}\)

Hok tốt

a) đây :

\(72^{45}-72^{44}=72^{44}\cdot72-72^{44}=72^{44}\cdot\left(72-1\right)\)

\(72^{44}-72^{43}=72^{43}\cdot72-72^{43}=72^{43}\cdot\left(72-1\right)\)

mà \(72^{44}>72^{43}\)=> \(72^{44}\cdot\left(72-1\right)>72^{43}\cdot\left(72-1\right)\)

=> \(72^{45}-72^{44}>72^{44}-72^{43}\)

cảm ơn bonking nhiều nha

\(72^{45}-72^{44}=72^{44}\left(72-1\right)=71.72^{44}\\ 72^{44}-72^{43}=72^{43}\left(72-1\right)=71.72^{43}\\ Vì:72^{44}>72^{43}\Rightarrow72^{44}.71>72^{43}.71\\ Nên:72^{45}-72^{44}>72^{44}-72^{43}\)

\(72^{45}-72^{44}\)và \(72^{44}-72^{43}\)

Ta có : \(72^{45}-72^{44}=72.72^{44}-72^{44}=72^{44}\left(72-1\right)=72^{44}.71.\)

\(\)\(72^{44}-72^{43}=72.72^{43}-72^{43}=72^{43}.\left(72-1\right)=72^{43}.71.\)

Vì \(72^{44}.71>72^{43}.71\Rightarrow72^{45}-72^{44}>72^{44}-72^{43}.\)

VẬY .....

72^45-72^44 = 72^44 (72-1)

 72^44-72^43 = 72^43 ( 72 -1 )

vì 72^44>72^43 => 72^44(72-1)>72^43(72-1)

Hay 72^45-72^44 > 72^44-72^43 

easy

\(72^{45}-72^{44}=72^{1+44}-72^{44}=72.72^{44}-72^{44}=\left(72-1\right).72^{44}=71.72^{44}\)

\(72^{44}-72^{43}=72^{1+43}-72^{43}=72.72^{43}-72^{43}=\left(72-1\right).72^{43}=71.72^{43}\)

Ta thấy \(71.72^{44}>71.72^{43}\Rightarrow72^{45}-72^{44}>72^{44}-72^{43}.\)

a) A>B

b) 72*45-72*44=72*44-72*43 ; 2*500=5*200

* là lũy thừa nha mấy chế

72^45 - 72^44 = 72^44 . 71

72^44 - 72^43 = 72^43 . 71

Vì 72^44 > 72^43

nên  72^44 . 71 > 72^43 . 71

==> A>B

A=72^45-72^44=72^44(72-1)=72^44x71

B=72^43x71

=>A>B