Toán Lớp 8: bài 42; CMR:55 ^n+1-55^n chia hết cho 54
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Toán Lớp 8: bài 42; CMR:55 ^n+1-55^n chia hết cho 54
Comments ( 2 )
55^(n+1)-55^n
=55^n . 55^1-55^n
=55^n . 55-55^n
=55^n . (55-1)
=55^n .54\vdots54
Vậy 55^(n+1)-55^n \vdots 54 với mọi n\inNN