[計量] 有疑惑的數學題
1. A certain medication is to be taken at the rate of one tablet
every 12 hours. Approximately how many weeks will a prescription of 100
tablets last?
answer:7 week
但是 12 hours 吃1個 1天->2個 100個-> 50天 =7 weeks +1天 應該是8周阿
2. a certain holiday is always on the fourth Tuesday of Month X. If
Month X has 30 days, on how many different dates of Month X can the holiday
fall?
完全不懂意思 也不知道怎麼求 請好心的人 解釋一下 並列式謝謝
ans: seven
3. how many positive integrers can be expressed as a product of two or more of
the prime number 5, 7, 11, and 13 if no one product is to include the same
prime factor more than once?
anwser: 11
這好像是機率 4個中選2個以上來乘積
但是不知道怎麼算耶
我原本想 取四個 只有一種
取三個 只有4種 (一個數拿掉其他相乘)
取兩個 只有4種 ４個取２個
共九種阿 怎麼會１１？
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