Glue

Bài 1b:
$46^n+13^n.296=46^n+13^n+13^n.295$

$(46^n+13^n)\vdots (46+13)$ (vì n lẻ) $\Rightarrow (46^n+13^n)\vdots 59$ mà $295.13^n\vdots 59$
nên $46^n+13^n.296\vdots 59$
$46^n+13^n.296=46^n-13^n+297.13^n$
$(46^n-13^n)\vdots (46-13)=33$ mà $297.13^n\vdots 33$ 
nên $46^n+13^n.296\vdots 33$
59.33=1947 mà $\left ( 59;33 \right )=1$
$\Rightarrow 46^n+13^n.296\vdots 1947 (đpcm)$