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72=2^3×3^2囙此72共有連1和其本身在內的(3+1)*(2+1)= 12個因數.這些因數中:素數有2個,就是2、3囙此合數有12 - 2 - 1 = 9個(總個數减去素數個數,减去因數1這1個):4、6、8、9、12、18、24、36、72.奇數就是1…
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