Dear sportwoman, ur too cute. It's ok to look up the answer.

來源: 環繞自然 於 2014-02-24 00:02:39 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (622 bytes)
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Dear 小曼，你太cute 了.
This is just a little mind teaser. Please feel free to look up the answer from the
previous 跟貼。It’s ok, if we are not math expert. 是吧？

Best regards!

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