百度试题 结果1 题目Find the sum of the arithmetic sequence.∑_(i=1)^∑(2i-3) 相关知识点: 试题来源: 解析 =3601a_1=2(1)-3=-1 a_(20)=2(20)-3=37 20 反馈 收藏
Sn=(n+1)(a1+an)/2 D. Sn=(n-1)(a1+an)/2 相关知识点: 试题来源: 解析 A。本题考查等差数列求和公式。选项 A 中 Sn 表示前 n 项和,n 是项数,a1 是首项,an 是末项。除以 2 是因为求和时首尾相加乘以项数再除以 2。选项 B 不是等差数列求和公式,选项 C 和 D 也不正确。反馈 收藏 ...
The formula for the sum of an arithmetic sequence is S = n(a₁ + aₙ)/2. What does n represent? A. The number of terms in the sequence. B. The common difference. C. The first term. D. The last term. 相关知识点:
The formula for the sum of an arithmetic sequence is S = n(a₁ + an)/2 (where n is the number of terms, a₁ is the first term and an is the nth term). If n = 10, a₁ = 2 and an = 18, what is the value of S?
Sum of the first 100 positive odd integers The Sum of an Arithmetic Sequence In mathematics, an arithmetic sequence or the arithmetic progression can be defined as a list of numbers in which each term is obtained by adding a fixed number in the preceding term, and ...
Finding the Sum of Arithmetic Sequence: An arithmetic sequence is a set of numbers in which the difference between consecutive terms is constant. The sum of an arithmetic sequence is calculated by using the formula given below: {eq}{S_n} = \dfrac{n}{2}\left[ {2{a_1} + ...
数列和级数 128-Convergence and Divergence The Return of Sequences and Series 09:40 使用积分检验和比较检验计算总和129-Estimating Sums Using the Integral Test and Comparison Test 09:56 交替级数、收敛类型和比率检验 130-Alternating Series, Types of Convergence, and the Ratio Test 12:09 幂级数 ...
The sum of the first five terms in an arithmetic sequence (等差数列) is 30. The sum of the last five terms is 95. The sum of all the terms is 225. How many terms are there in this sequence? 相关知识点: 试题来源: 解析 18 一个等差数列的前五项和为30,最后五项和为95,所有项之和为...
The sum of the first 10terms of the sequence is 162.(a) Show that 10a+45 d =162Given also that the sixth term of the sequence is 17.(b) write down a secon d equation in a an d d,(c) fin d the value of a an d the value of d. ...
结果1 题目 arithmetic series The sum of the terms in an arithmetic sequence. For a sequence with the first term a and common difference d, the sum of n is na+(n(n-1)d)/2 相关知识点: 试题来源: 解析 优质解答 反馈 收藏 ...