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Mathematics
Senior High
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祁燁yun_ting
祁燁yun_ting

求解，謝謝。

20.若 1 n - + 2 3 + n n + 12 n 為整數,則n的整数解有 個。

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✨ Best Answer ✨

Kate.
Kate.

1/n*（12+11+…+1）
=1/n*13*12/2
=78/n
所以n是78的因數 有6個

祁燁yun_ting
祁燁yun_ting

感謝🙏

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