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a x b = ( 10 - a ) x ( 10 - b ) + 10 x a + 10 x b - 100
a x b = ( 10 - a ) x ( 10 - b ) + 10 x ( a + b - 10 )
a x b = ( 10 - a ) x ( 10 - b ) + 10 x [ ( a - 5 ) + ( b - 5 ) ]
a x b = [5 - ( a - 5 )] x [5 - ( b - 5 )]
¡@¡@¡@ + 10 x [( a - 5 ) + ( b - 5 )]

¡@¡@¨ä¤¤( a - 5 )»P( b - 5 )´N¬O§Ú­Ì¥ª¥k¤â¦ù¥Xªº«üÀY¼Æ¡]¢´¤ñ¹s¤ä«üÀY¡A¢µ¤ñ¤@¤ä¡A¢¶¤ñ¨â¤ä¡A¢·¤ñ¤T¤ä¡A¢¸¤ñ¥|¤ä¡A«üÀY¼Æ­è¦n³£¬O­n¤ñªº¼Æ¦r´î±¼¢´¡^¡F¦Ó[5 - ( a - 5 )]»P[5 - ( b - 5 )]´N¬O§Ú­Ì¥ª¥k¤âÅsµÛªº«üÀY¼Æ¡C
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a x b = ¥ª¤âÅsµÛªº«üÀY¼Æ£A¥k¤âÅsµÛªº«üÀY¼Æ
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¡@¡@´N¬O§Ú­Ì©Ò¥Îªº³o­Ó¯«©_ºâªk°Õ¡I¦Ü©ó­n­­¨î¢´¥H¤Wªº¼Æ¦r¤~¯à¥Î¡A¬O¬°¤F­nº¡¨¬¡¨( a - 5 )»P( b - 5 )´N¬O§Ú­Ì¥ª¥k¤â¦ù¥Xªº«üÀY¼Æ¡¨³o­Ó±ø¥ó¦Ó©wªº¡C

2003/08/01°_°ÑÆ[¤H¦¸¡G 43512277
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