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126 名前：以下、名無しにかわりましてVIPがお送りします[] 投稿日：2010/02/27(土) 19:37:28.67 ID:q4/12WN80
一日に５ｃｍずつ水位の下がっていくダムがあったとして
３日後には今日より１５ｃｍ水位が低くなる
これが（－５ｃｍ/日）×３日＝－１５ｃｍ

逆に３日前を考えると
（－５ｃｍ/日）×（－３日）＝＋１５ｃｍ

って説明が中学の教科書に載ってた気がする

— VIPPERな俺 : マイナス×マイナス＝プラス　←これ理論的に説明できる人いる？ (via hazime1373) (via petapeta) (via axx01)

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