由于数列1,2,4,8,16,32,…的第一项是1,且是公比为2的等比数列,故通项公式是 an=1×qn-1=2n-1,故此数列的一个通项公式an=2n-1,故选B. 观察此数列是首项是1,且是公比为2的等比数列,根据等比数列的通项公式求出此数列 的一个通项公式. 本题考点:等比数列的通项公式. 考点点评:本题主要考查求等...
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英汉互译。 1. 一张邮票 ___ 3. 发送一封电子邮件 ___ 5. 直走 ___ 2. have a computer ___ 4. write an e-mail ___ 6. in Canada ___ 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 1. a stamp 2. 拥有一台电脑 3. send an e-mail 4. 写一封电子邮件 5...
To expand a 4-bit parallel adder to an 8-bit parallel adder, you must把4位并行加法器扩展成8位并行加法器,必须? use two 4-bit adders and with the carry output of one connected to the carry input of the other.使用两个4位并行加法器,并且将其中一个的进位输出端连接到另一个的进位输入端上...
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已知数列{an}中,a1=1,an+1=1- 4 an+3 ,求数列{an}的通项公式. 试题答案 在线课程 考点:数列递推式 专题:点列、递归数列与数学归纳法 分析:根据递推公式,求出a2,a3,a4,a5,a6,a7,找到规律即求出数列{an}的通项公式. 解答: n+1 4
() 2. Is it on the second floor?() 3. How many students?() 4. Is this your computer room?() 5. Do you have an art room?A. It's on the first floor.B. Forty-five students.C. No, it isn't.D. Yes, it is my computer coom.E. Yes, we do....
alpha 4 integrins mediate cell-cell and cell-extracellular matrix interactions that are critical for maturation and function of the immune system as well as differentiation of skeletal muscle. Here we examine molecular mechanisms controlling the pattern of alpha 4 expression. The activity of constructs...
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To view an email in Internet Explorer, use the following steps. Double-click the email to open it in its own window. These steps will not work from the Reading Pane. In theMovegroup on the Ribbon, selectMore Move Actions>View in Browser. ...