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15问答网 > 一个长方体的长,宽,高,分别是7厘米,6厘米和5厘米,它的棱长总和是多少厘米

一个长方体的长,宽,高,分别是7厘米,6厘米和5厘米,它的棱长总和是多少厘米

2025-04-06 22:44:05

推荐回答（1个）

回答1：

1.棱长总和（7+6+5）*4=72厘米.无盖就是求四个侧面和一个底面了啦.7*5*2+6*5*2+7*6=172平方厘米
2.不知道你的横着是指哪一面（6+10）*2+3*4+2=46分米或者是3*4*2+（6+10）+2=42分米要看你是指哪一种情况了
3.30*3.5*20=2100平方米厚度不用管是起迷惑作用的
4、10x5x4+5x5x2=250平方厘米
5、2x2x1.5/80=0.075立方米合0.075x1000=75立方分米
6、正方体体积=长方体体积=80x80x80=512000立方厘米
设熔铸后长方体的棱长为x、y、z
那么xy=20 xyz=512000 得出z为25600 即长方体长为25600厘米

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