jQuery -> 获取／设置／删除DOM元素的属性

时间：2014-05-23 02:26:51 收藏：0 阅读：309

Sum square difference

The sum of the squares of the first ten natural numbers is,

1² + 2² + ... + 10² = 385

The square of the sum of the first ten natural numbers is,

(1 + 2 + ... + 10)² = 55² = 3025

Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

补充两个公式

$bubuko.com,布布扣$ 证明：倒序相加，

$bubuko.com,布布扣$ 证明：数学归纳法

这都是高中的题目

给出我的python代码：

n = 100
s1 = n*(n+1)/2 # sum of (1..n)1+2+....+n
s2 = n*(n+1)*(2*n+1)/6 # sum of (1+2**2+3**2+...n**2)
print s1**2-s2