加法:addition 減法:subtraction 乘法:multiplication 除法:division + plus – minus × times ÷ divided by 覺得這支影片實用的話, ... ... <看更多>
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加法:addition 減法:subtraction 乘法:multiplication 除法:division + plus – minus × times ÷ divided by 覺得這支影片實用的話, ... ... <看更多>