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Re: [解題] 國二數學 等差數列
[ tutor ]11 留言, 推噓總分: +4
作者: stampete - 發表於 2011/03/21 00:06(15年前)
4F→blue155305:為什麼不用梯形公式找出個數加起來去掉偶數03/21 18:22
5F→blue155305:雖然比較笨蛋事是比較容易理解的解法03/21 18:22
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