基础数学 示例

热门问题
基础数学
求平均值 an arithmetic progression consists of 27 terms. the middle term is 75 find the sum of all terms.
an arithmetic progression consists of terms. the middle term is find the sum of all terms.
解题步骤 1
一组数的平均值为其总和除以其个数。
解题步骤 2
将 和 相加。
解题步骤 3
用 除以 。