Toán Lớp 8: cmr: n^3-x ⋮6( n là số nguyên)
HELP PLEASE
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Toán Lớp 8: cmr: n^3-x ⋮6( n là số nguyên)
HELP PLEASE
Comments ( 1 )
A = {n^3} – n\\
= n\left( {{n^2} – 1} \right)\\
= n\left( {n – 1} \right)\left( {n + 1} \right)
\end{array}$
\Leftrightarrow A \vdots 2;A \vdots 3\\
\Leftrightarrow A \vdots 6
\end{array}$