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44-9先算什麼再算什麼
44-9先算什麼再算什麼
更新时间:2025-07-04 22:47:14

先算10-9再算34+1。退位加減法一般先算個位再算十位,可以先借一位就是10-7,再算十位,34+1,最後得出結果35。

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