Thank you so much !! If I did not learn Calculus,how could I sol
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回複:Thank you so much !! If I did not learn Calculus,how could I
-oldbookworm-
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10/02/2009 postreply
21:47:15
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Thanks! I get your idea.
-pingshi-
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10/02/2009 postreply
23:54:18