123x321 is easy, 987x789 is hard for this method.
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哈哈哈哈, 987x789 is easy only for calculator
-500miles-
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05/02/2010 postreply
05:17:10
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那不成了五線譜了。
-xia19878-
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05/02/2010 postreply
06:55:29
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987x789? Easy! 123456789*987654321, a bit more challenging.
-diaozhi-
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05/02/2010 postreply
15:26:49