因为一共只上了5层楼梯,所以6-1=5（层）
30/5=6（秒）
答：小明平均每上一层楼用6秒.
小明家住在6楼,他从1楼走到6楼用了30秒.小明平均每上一层楼用多少秒?
小明家住在6楼,他从1楼走到6楼用了30秒.小明平均每上一层楼用多少秒?
数学人气：382 ℃时间：2020-04-19 16:38:00
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