1楼错误.
横截面周长是
80÷5＝16厘米
宽和高是
16÷4＝4厘米
表面积是
（40×4＋40×4＋4×4）×2＝672平方厘米
一个长40厘米,截面是正方形的长方体,如果长增加5厘米,表面积就增加80平方厘米,求原长方体的表面积.
一个长40厘米,截面是正方形的长方体,如果长增加5厘米,表面积就增加80平方厘米,求原长方体的表面积.
数学人气：185 ℃时间：2019-12-05 23:39:16
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