Toán Lớp 6: chứng mình rằng: 79^n+1+79^n chia hết cho 80
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: chứng mình rằng: 79^n+1+79^n chia hết cho 80
Comments ( 2 )
$=79^n.79+79^n$
$=79^n.(79+1)$
$=79^n.80\vdots80$
Vậy $79^{n+1}+79^n\vdots80(đpcm)$