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58问答库 > 某品牌的一种牙膏出口处是直径为4毫米的圆形，小红每次刷牙都挤出1厘米长的牙膏．这样，一支牙膏可用50次

某品牌的一种牙膏出口处是直径为4毫米的圆形，小红每次刷牙都挤出1厘米长的牙膏．这样，一支牙膏可用50次

2025-04-07 06:53:15

推荐回答（1个）

回答（1）：

1厘米=10毫米
3.14×（4÷2）²×10×50÷[3.14×（5÷2）²×10]
=3.14×4×500÷[3.14×62.5]
=3.14×4×500÷3.14÷62.5
=3.14÷3.14×2000÷62.5
=32（次）
答：这一支牙膏只能用32次．

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