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58问答库 > 牙膏出口处直径为5MM,小红每次刷牙都挤出长1CM长的牙膏.这样,一只牙膏可用36次,新推出的牙膏直径该为6MM,

牙膏出口处直径为5MM,小红每次刷牙都挤出长1CM长的牙膏.这样,一只牙膏可用36次,新推出的牙膏直径该为6MM,

2025-04-06 21:46:56

推荐回答（3个）

回答（1）：

1㎝＝10㎜ 3.14×（5÷2）²×10×36＝7065（mm³） 7065÷［3.14×（6÷2）²×10］＝25（次）

回答（2）：

30次，用体积算一下就可以知道

回答（3）：

5÷2=2.5
2.5×2.5×1×36=225
6÷2=3
3×3×1=9
225÷9=25（次）

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