1-1質數和合數

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1的因數有哪些？

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2的因數有哪些？

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3的因數有哪些?

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4的因數有哪些？

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5的因數有哪些？

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6的因數有哪些？

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7的因數有哪些？

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8的因數有哪些？

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9的因數有哪些?

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10的因數有哪些?

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11的因數有哪些?

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12的因數有哪些？​

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13的因數有哪些?

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14的因數有哪些?

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15的因數有哪些?

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16的因數有哪些?

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17的因數有哪些?

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18的因數有哪些?

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18

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19的因數有哪些?

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20的因數有哪些?

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