File:益古演段 自序.PNG
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| Description |
中文：李冶《益古演段》自序 |
| Date | |
| Source | 丛书集成初编《益古演段》（据知不足斋丛书本排印）民国 商务印书馆发行 |
| Author | 李冶 |
李冶的《益古演段》是一部数学教科书，以比较浅显的方式说明用方程（天元术）解题的方法。
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:19, 31 October 2009 | | 530 × 652 (71 KB) | Irrons (talk | contribs) | {{Information |Description={{zh|1=李冶《益古演段》自序}} |Source=丛书集成初编《益古演段》（据知不足斋丛书本排印）民国 商务印书馆发行 |Author=李冶 |Date=1813 |Permission= |other_versions= }} 李冶的《益古� |
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