We first introduce methods of finding the sum of the first n terms for an arithmetic sequence of higher order.
我们首先介绍了高阶等差数列前n项和的求解方法。
You have n branches on the tree and you count the number of leaves and sum them up.
你计算了树上n个树枝，并数出树叶的数目并计算出总和。
N ow, work in groups to sum up the names of the clothes we have learnt and each group asks one student to report the results to the class.
学生进行小组讨论，归纳出所学过的服装名称。然后推荐一位代表向全班学生汇报，看哪一组归纳得最多。
We first introduce three methods of finding the sum of the first n terms for an arithmetic sequence of higher order, and then display another method by some formal derivatives of which are defined.
首先，简要介绍了三种主要的求和方法。然后，根据高阶等差数列通项的特性，利用新定义的形式导数列对其进行了有效的探讨。
For each case, output sum (n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.
对于每一种情况，SUM在空白行之后的单独的一行输出。假定所有的结果都在有符号的32位整型范围之内。
This problem of a fifth power mean value computing formula of base 3 digits sum has been solved, and an exact calculation formulaA5(N)has been obtained.
主要解决了三进制之和函数五次均值的计算问题，得出了一个精确的计算公式。
This problem of a fifth power mean value computing formula of base 3 digits sum has been solved, and an exact calculation formulaA5(N)has been obtained.
主要解决了三进制之和函数五次均值的计算问题，得出了一个精确的计算公式。
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