80-45=35,这是一半油的重量；
35*2=70,这是全部油的重量；
80-70=10,这是桶的重量.
一桶油,连桶一共重80千克,用去一半油后,连桶一共重45千克,那么桶重多少千克?
一桶油,连桶一共重80千克,用去一半油后,连桶一共重45千克,那么桶重多少千克?
数学人气：595 ℃时间：2020-02-03 18:52:59
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