Question

平方和立方13+23+33+43+53=(1+2+3+4+5)213+23+33+43+53……n3=(1+2+3+4+

Answer 1

1^2+2^2+...+n^2=n(n+1)(2n+1)/6

1^3+2^3+...+n^3=n*n*(n+1)*(n+1)/4