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都是“倍数”惹的祸
2013
金鱼老师为学生们布置了这样一道题: 左盘有7根香蕉,右盘有5根香蕉: (1)从右边拿()根到左边,左边的根数正好是右边的2倍. (2)从右边拿()根到左边,左边的根数正好是右边的3倍. (3)从右边拿()根到左边,左边的根数正好是右边的5倍.
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