| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an "abacus workbook with practical examples (including video image and audio CD)", which is produced based on the samples of actual economic activities and enables users to develop their practical computing skills and knowledge on economic activities necessary in the real world when the users do calculation exercises with an abacus. <P>SOLUTION: Abacus practice exercises are generated based on the samples of actual economic activities and compiled into an "abacus workbook with practical examples (including video image and audio CD)", which includes a book, an audio CD, a DVD video and the like. <P>COPYRIGHT: (C)2012,JPO&INPIT |
