Please think that only ai is variables others are constant.

来源: jinjing 于 2010-09-03 13:21:15 [] [旧帖] [给我悄悄话] 阅读数 : (121 bytes)
回答: 这能问数学问题马？ 由 brakepad 于 2010-09-02 18:40:17

I think your Prof. want to check your concept.Why did you write W=...,according to your test book you can get answer.

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