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$$1+2+3+......+n$$=$$\frac{n(n+1)}{2}$$
For each integer $$n$$ greater than 1, the sum of the first $$n$$ positive integers is given by the formula shown.
If the average (arithmetic mean) of the first $$n$$ positive integers is $$k$$, what is the sum of the first $$n$$ positive integers in terms of $$k$$?
For each integer $$n$$ greater than 1, the sum of the first $$n$$ positive integers is given by the formula shown.
If the average (arithmetic mean) of the first $$n$$ positive integers is $$k$$, what is the sum of the first $$n$$ positive integers in terms of $$k$$?
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· 相关考点
3.1.1 代数式基本运算原理
3.1.1 代数式基本运算原理
以上解析由 考满分老师提供。
