第一個序列是隔項相約,隻有偶數項時,才會如你所述
所有跟帖:
• 第一序列分子是1,2,3,4,5…分母是3,4,5,6,7相約後,分子為2,分母為6*7即是n(n+). 這時,n=6. -wxcfan123- ♂ (0 bytes) () 05/14/2022 postreply 08:40:42
• 驗算了一下,你是對的 -萬斤油- ♂ (0 bytes) () 05/14/2022 postreply 09:04:44
• 第一序列分子是1,2,3,4,5…分母是3,4,5,6,7相約後,分子為2,分母為6*7即是n(n+). 這時,n=6. -wxcfan123- ♂ (0 bytes) () 05/14/2022 postreply 08:40:42
• 驗算了一下,你是對的 -萬斤油- ♂ (0 bytes) () 05/14/2022 postreply 09:04:44
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