Question

奥数题请详解谢谢！

121+232+343+454+565+676+787+898

Answer 1

121+232+343+454+565+676+787+898
=(121+898)+(232+787)+(343+676)+(454+565)
=1019+1019+1019+1019
=1019×4
=4076

Answer 2

121+232+343+454+565+676+787+898
=100*(1+2+3+4+5+6+7+8)+10*(2+3+4+5+6+7+8+9)+(1+2+3+4+5+6+7+8)
=3600+440+36
=4076