数列是高中数学很重要的内容之一,数列中求通项的问题也是最常见的题型,其形式多样,解法灵活.请你谈谈几种常用的求数列通项的方法.
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A、B两个程序,程序A按顺序使用CPU 10s,使用设备甲5s,使用CPU 5s,使用设备乙5s,最后使用CPU 10s。程序B按顺序使用设备甲10s,使用CPU 10s,使用设备乙5s,使用CPU 5s,使用设备乙10s。试问: a.在顺序环境下执行程序A和程序B,CPU的利用率是多少 b.在多道程序环境下,CPU的利用率是多少
校园安全十分重要2. 因此,学校应当……3. 我们自己应当…… Campus Safety_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Questions 19 to 22 are based on the conversation you have just heard.
A. He has a feeling of insecurity.
B. He is missing his family.
C. He lacks self-confidence.
D. He feels ill.
Passage Two Questions 30 to 32 are based on the passage you have just heard.
A. TV children are famous stars.
B. TV children have classes everywhere.
C. TV children get education all the year round.
D. TV children are interested in visiting different places.