数学题:小明家住7楼，他从一楼走到三楼用了三分之二分钟，再从3楼走到7楼要用多少时间？（提问：芷静-资优网）

数学题解答：

从一楼到三楼要上两层楼，先算出上一层楼的时间；从三楼到七楼需要上四层楼，再算出时间。

2/3 ÷ (3-1) × (7-3)=4/3（分钟）

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