Toán Lớp 8: CMR: 55 mũ n+1 – 55 mũ n : ( chia hết) 54 ( n thuộc N )
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Toán Lớp 8: CMR: 55 mũ n+1 – 55 mũ n : ( chia hết) 54 ( n thuộc N )
Comments ( 2 )
$55^{n+1}$ $-$ $55^n$ $=$ $55^n$ $.$ $55$ $-$ $55^n$ $.$ $1$
$=$ $55^n$ $.$ $($ $55$ $-$ $1)$
$=$ $55^n$ $.$ $54$ : $54$ $($ $n$ $∈$ $N$ $)$
Vậy điều phải chứng minh
$@Dino. Shun$