九九归一

九九歸一
jiǔjiǔguī
  1. nine divide by nine is one (abacus rule)
  2. when all is said and done

CEDICT

珠算归除还原口诀转来转去比喻归根结底:「这个随你怎麽最后九九归一吃亏还是。」九九」。

重編國語辭典

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