有3种情况
但是小学的只要一种答案：把长截成相等的3段（切2次）,这里增加了4个侧面,一个侧面面积为5*5=25平方厘米.所以表面积比原来增加4*25=100平方厘米
一块木材,长180cm,宽5cm,高5cm,截成相等的3段,表面积之和比原来增加多少?
一块木材,长180cm,宽5cm,高5cm,截成相等的3段,表面积之和比原来增加多少?
数学人气：753 ℃时间：2019-11-05 21:51:50
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