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Scope: 清史稿 |
Condition : References “数学九章” |
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14 ![](more.gif) | 其指识正、负开方也,「元李冶传洞渊九容术,撰测圆海镜、益古演段,以明天元如积相消,其究必用正、负开方,互详于宋秦九韶数学九章。梅文穆公虽指天元一为西人借根方所由来,而正、负开方则未有阐明者。元和李秀才锐特为雠校,谓少广一章,得此始贯于一。好古之士,翕然相从。莱独推其有可知、有不可知。如测圆海镜边股第五问『圜田求径二百四十步与五百七十六步共数』,而李仁卿专以二百四十为答。数学九章田域第二题『尖田求积二百四十步与八百四十步共数』,而秦道古专以八百四十为答。乃自二乘方以下,缕析推之,得九十五条。凡几根数为带纵长阔较则可知,为带纵长阔和则不可知。又推得几真数少,几根数又多,几平方与一立方积等多少杂糅,和较莫定。立法以审之,以几平方数用几立方数除之,得数乘几根数,以较几真数。若少于真数,则以几平方为高阔较,是为可知。若多于真数,则或几平方为通分法,三母总数、几真数为三母维乘之共数,几根数为通分之共子,如二、如六、如十二。设真数一百四十四,少二百八,根数多二十,平方积与一立方积相等,则三数皆同,是为不可知。」 |
34 ![](more.gif) | 又从同里顾千里处得秦九韶数学九章,见其亦有天元一之名,而其术则置奇于右上,定于右下,立天元一于左上。先以右上除右下,所得商数与左上相生,入于左下。依次上下相生,至右上末后奇一而止,乃验左上所得以为乘率。与李书立天元一于太极上,如积求之,得寄左数与同数相消之法不同。因知秦书乃大衍求一中之又一天元,秦与李虽同时,而宋元则南北隔绝,两家之术,无缘流通,盖各有所授也。 |
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