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13问答网 > 做一个底座一个长9分米宽7分米的长方体无盖纸箱需要纸多少平方米接触忽略不计？

做一个底座一个长9分米宽7分米的长方体无盖纸箱需要纸多少平方米接触忽略不计？

2025-03-16 01:59:32

推荐回答（1个）

回答1：

要求长方体无盖纸箱所需要纸的面积，
其实就是求长方体除上盖之外的表面积。
无盖长方体表面积
=底面积+前后侧面积+左右侧面积
=长×宽+长×高×2+宽×高×2
所以，底面积=9×7=63（平方分米）
但求侧面积，缺少长方体的高，因此最终结果求不到。

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