Re: [計量] 請問一題
※ 引述《amekopb (老實人至上)》之銘言：
: A phone call from City X to City Y costs $ 1.00 for the first 3 minutes
: and $0.20 for each addtional minute. If r is an integer greater than 3,
: a phone call r minutes long will cost how many ""dollars""?
: A: (r+2)/5
The first 3 mins: 1
The rest r - 3 mins: (r - 3)*0.2
Total: 1 + (r - 3)*0.2 = (r + 2)/5
: choice A
: The depth of the water when the is level and rests on one of its 30 by 50
------------------------ 我看不懂這一段，是 typo 嘛?
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David
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