儿童的负重最好不要超过体重的20分之3
- 时间:2020-05-14 13:29:37
- 分类:数学世界
- 阅读:101 次
数学题:儿童的负重最好不要超过体重的20分之3。如果长期背负过重的物体,会导致腰痛及背痛,严重的甚至会妨碍骨骼生长。小乐的书包超重吗?为什么?(书包重5kg,体重30kg)
数学题解答:超了,5/30大于3/20。
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