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来自维基百科,自由的百科全书
去九法的应用要追溯至萨珊王朝时代。当时伊斯兰文化贸易兴盛,应商业的需求,就产生了去九法,以验算交易中运算。
因此可得知:
所以,在ABC+DEF=GHI的运算中,
所以证明了此式并无错误。
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