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(56-17)÷(12+12×12)=39÷34=39×43=52(千克)56-52=4(千克)答:原來這桶油重52千克,桶重是4千克.
8分之5=0.625=【25】÷40 如果本題有什麼不明白可以追問, 如有其它問題,請諒解,
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