常识“开差立”是什么意思，起源、典故、生平简介及释义-历史文化

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常识	开差立
释义	开差立古代算学术语。祖冲之数学成就之一。《隋书·律历志》：“兼以正负（原为‘圆’，钱宝琮校作‘负’）参之”，学术界一般认为，此系求解形如x³±kx²±lx＝A的正根，其中k、l可为正数，A为正，是为中国数学史上首次出现负系数三次方程。
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