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作者 Sinful 在 PTT [ Math ] 看板的留言(推文), 共3則
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1F推:兩項直接展開,奇數次項會對消, 剩偶數次項都是整數05/18 14:36
1F推:(1) 可朝平方差公式去想05/14 17:54
2F推:(2) 可以試著將各項化為假分數05/14 17:56
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