1+12+23+34+45+56+67+78+89+910+1011+1112+1213+1314+1415+1516+1617+1718+1819+19=几
问题描述:
1+12+23+34+45+56+67+78+89+910+1011+1112+1213+1314+1415+1516+1617+1718+1819+19=几
答
140691+2+3+4+5+6+7+8+9..............+15962+15963=几