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1. According to your suggestion, other symbols were introduced and the equations of parts 4 and 5 were simplified. As a result, the sizes of the questions suit the page size and better to be understood.
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math105(½ð±Ò+50): ллÄãµÄÈÈÐİïÖú£¡ 2011-02-10 21:00:38
we apologize for our mistake, we have changed 5 into 4.  

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