m=a1+an2m= \frac{a_1+a_n}{2}m=2a1+an Infinite arithmetic sequences don't have a last term, and therefore their mean is undefined. Instead, a mean for a partial sum can be found by limiting the sum to a defined number of terms. In that case, the partial sum and ...
该算数数列的第100个数是:1,5,9,13,17,21,25,⋯? 要从算术序列的第一项到第100项,我们必须加上99倍的公差.第一项为1,公差为5−1=9−5=13−9=⋯=4,因此第100项为1+4(99)=397. 故选A.结果一 题目 What is the 100th number in the arithmetic sequence: 1,5,9,13,17,21,25,?
百度试题 结果1 题目【题目】In an arithmetic sequence, what is the relationship between the second term + eighth term and the fourthterm+sinthterm? 相关知识点: 试题来源: 解析 【解析】a_2+a_8=a_4+a_6 反馈 收藏
百度试题 结果1 题目In the arithmetic sequence 2, 5, 8, 11, ⋯, what is the sum of its first ten terms?相关知识点: 试题来源: 解析 155.
The sequence 2, 4, 6, 8,... is an arithmetic sequence. What is the common difference? A. 1 B. 2 C. 3 D. 4 相关知识点: 试题来源: 解析 B。解析:这个数列是等差数列,后一项减去前一项为定值,4-2=2,6-4=2,8-6=2,所以公差是 2。
百度试题 结果1 题目【题目】T he first four terms of an arithmetic sequence arep, 9, 3p-q, and 3p+q. What is the 2010th term of this sequence?()A.8041B.8043C.8045D.8047E.8049 相关知识点: 试题来源: 解析 【解析】A 反馈 收藏 ...
10、 连续数例 1:In an increasing sequence of 10 consecutive integers, the sum of the first 5 integers is 560. What is the sum of the last 5 integers in the sequence?(A) 585 (B) 580 (C )575 (D)570 (E) 565例 2:If n is an integer greater than 6, which of the following mus...
Why is this an arithmetic sequence? Because the difference between all successive elements is always the same—2002 – 2001 = 1, 2010 – 2009 = 1—the difference is always 1. Notice I’ve used ellipses here in the middle of the sequence. What does that mean? Well, ellipses are used li...
In the arithmetic sequence t(1),t(2),t(3), … , t(n) , … , t(1)= 23 and t(n) = t(n-1) - 3 for each n > 1. What is the value of n when tn = -4? 选项: A、-1 B、7 C、10 D、14 E、20 答案: C 经典答疑 发起提问 × Close 还没有人问到这里,扫码...
(1988 AMC 8 Problem, Question #19) What is the 100th number in the arithmetic sequence 1, 5, 9, 13, 17, 21, 25, ⋯ ?( )A. 397 B. 399 C. 401 D. 403 E. 405 相关知识点: 试题来源: 解析 A 1+(5−1)×99=397.