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- ♂ (749 bytes) () 10/02/2009 postreply 21:47:15
• Thanks! I get your idea. -pingshi- ♂ (0 bytes) () 10/02/2009 postreply 23:54:18