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6F推: 右邊的是無窮等比級數和,左邊是級數前四項09/11 07:26
7F→: 公比要在-1跟1之間,所以是C09/11 07:26
9F→: 更正一下,是級數前五項09/11 07:30
1F→: 協助修改標題09/01 23:55
1F→: 請附上必要之資訊08/31 01:50
1F推: S={15,16,17,18,19} 1+2+3+4+5=15 15+6=21(不合) n=508/24 21:59
1F→: 請補足必要之資訊08/24 17:54
1F→: 請補必要之資訊 #1KrYUl4d08/17 23:00
1F→: 請補適合之考試08/16 22:31
1F→: 協助更改分類為[贈送]08/15 15:46
1F→: 請補分類08/08 16:13
1F推: 請必要之資訊08/07 08:05