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40-7先算什麼再算什麼
40-7先算什麼再算什麼
更新时间:2025-01-23 13:01:47

先算10-7再算30+3。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,30+3,最後得出結果。

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