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从10数到100共数几个9
更新时间: 2020-10-27 00:00:00  

从10数到100共数十九个关于9的数字。9在个位上一共有10个:分别是9、19、29、39、49、59、69、79、89、99。9在十位上一共有10个:分别是90、91、92、93、94、95、96、97、98、99。所以从10数到100一共有十九个9。

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