=(99²-89²)+(98²-88²)+……+(90²-80²)
=(99+89)(99-89)+(98+88)(98-88)+……+(90+80)(90-80)
=(99+89)*10+(98+88)*10+……+(90+80)*10
=(80+81+82+……+99)*10
=(80+99)*20/2*10
=17900