A quick way of calculating the mean of an arithmetic sequence is to use the observation that, when the first and last terms are added, the sum is the same as when the second and next to last terms are added or the third and third to last terms. As a result, the sum of the sequen...
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。
Arithmetic is a branch of mathematics. Arithmetic includes different mathematical operations such as addition, subtraction, multiplication and division. Learn the basics of arithmetic with examples at BYJU’S.
The sequence , , , , is an arithmetic progression. What is ?( ) A: B: C: D: E: 相关知识点: 试题来源: 解析 B N/A. 反馈 收藏
it sounds complicated, but it’s really pretty simple. An arithmetic sequence is a sequence of numbers where the difference between any two successive elements is always the same constant value. For example, the sequence of years since the start of the new millennium is an arithmetic sequence:...
In an arithmetic sequence, the second term is 8 and the fifth term is 17. What is the common difference? A. 3 B. 4 C. 5 D. 6 相关知识点: 试题来源: 解析 A。解析:设首项为 a1,公差为 d。由 a2 = a1+d = 8,a5 = a1+4d = 17。将第一个式子变形为 a1 = 8 - d,代入第二...
In an arithmetic sequence, if the 5th term is 20 and the 8th term is 32, what is the first term? A. -4 B. C. 4 D. 8 相关知识点: 试题来源: 解析 A。解析:由通项公式可得 a5 = a1 + 4d = 20 ,a8 = a1 + 7d = 32 。两式相减消去 a1 ,得 3d = 12 ,d = 4 。将 d =...
故选A.结果一 题目 What is the 100th number in the arithmetic sequence: 1,5,9,13,17,21,25,?( ).A.397B.399C.401D.403E.405 答案 A相关推荐 1What is the 100th number in the arithmetic sequence: 1,5,9,13,17,21,25,?( ).A.397B.399C.401D.403E.405 反馈...
The 6th term of an arithmetic sequence is 20 and the 10th term is 32. What is the first term? A. 2 B. 4 C. 6 D. 8 相关知识点: 试题来源: 解析 A。解析:设首项为 a1,公差为 d。由 a6 = a1+5d = 20,a10 = a1+9d = 32。用第二个式子减去第一个式子可得 4d = 12,d = 3...
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. 反馈 收藏