# 整除、因數、倍數

$6\div 3=2\cdots 0$

$\Rightarrow$ $6$ 被 $3$ 整除或 $3$ 整除 $6$。

$\Rightarrow$ $6$ 是 $3$ 的倍數， $3$ 是 $6$ 的因數。

$6=1\times 6=2\times 3=(-1)\times (-6)=(-2)\times (-3)$

$\Rightarrow$ $6$ 是 $\pm 1$ 、 $\pm 2$ 、 $\pm 3$ 、 $\pm 6$ 的倍數； $\pm 1$ 、 $\pm 2$ 、 $\pm 3$ 、 $\pm 6$ 都是 $6$ 的因數。

※ 國中階段如無特別說明，所指的因數與倍數都是正因數與正倍數。

★ $1$ 是任意正整數的因數。

★ $0$ 是任意正整數的倍數。
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