副食店运来大米和面粉各9袋。大米每袋80千克，面粉每袋50千克。运来大米和面粉共多少千克？
计算下面各题．===﹣= 1﹣=﹣==﹣==
看谁算得又对又快．======．
3与4的倒数之差是多少？
算一算．+=﹣=+=+=﹣=﹣=
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