1^2+2^2+3^2+…+n^2=__________
1^3+2^3+3^3+…+n^3=__________
1^2+2^2+3^2+…+n^2=__________
1^3+2^3+3^3+…+n^3=__________
1^2+2^2+3^2+…+n^2=[n(n+1)(2n+1)]/6
1^3+2^3+3^3+…+n^3=(n+1)^2xn^2/4
1^2+2^2+3^2+…+n^2=__(n/2(1+n)_)_^2______
1^3+2^3+3^3+…+n^3=___(n/2(1+n)_)_^3______________