制作一个长4.5cm,宽4cm,5cm的火柴盒的外壳和内盒,至少要多少薄木板(连接处不计)
人气:494 ℃ 时间:2019-10-23 07:16:01
解答
外壳:4.5x4x2+4.5x1.5x2=36+13.5=49.5(平方厘米)
内盒:4.5x4+4.5x1.5x2+4x1.5x2=18+13.5+12=43.5(平方厘米)
表面积:49.5+43.5=93(平方厘米)
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