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三年级数学，易错题，培优题，学会“爬楼梯”挑战学霸
三年级数学，易错题，培优题。张小乐家住在24楼，一天停电，张小乐只好爬楼梯回家。每相邻两个楼层之间的台阶都是12级，他回到家一共要爬多少级台阶？
人教版三年级数学下册，典型题、易错题、培优题(与教材同步）37/95
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