4+14+24+.+114=

问题描述:

4+14+24+.+114=
我很需要答案

4+14+24+34+44+54+64+74+84+94+104+114
=(4+114)+(14+104)+(24+94)+(34+84)+(44+74)+(54+64)
=118+118+118+118+118+118
=118*6
=708