1. 09:16 9th Oct 2009

    Notes: 242

    # AのB%＝BのA%

    ちょっと計算すればわかります。「25の16%は16の25%だから4」とか。どちらかの数字がきりがよければ使えますね。

    — 暗記しておくとなにかと便利なプチ公式まとめ - IDEA*IDEA ～ 百式管理人のライフハックブログ
     
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