1^3+2^3+3^3+4^3+…+N^3=（n(n+1)/2)^21^2+2^2+3^2+4^2+…+N^2=n(n+1)(2n+1)/61^3+2^3+3^3+4^3+…+100^3=(100*101/2)^2=5050^2>(5002)^2
1^3+2^3+3^3+4^3+…+100^3=(100*101/2)^2 =5050^2>(5002)^2
=505
