8+11+14+17+20+·······+305 数学计算题.呜呜呜1+2+3+4+···················+98_数学解答

8+11+14+17+20+·······+305 数学计算题.呜呜呜
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1

人气：376 ℃　时间：2020-09-14 18:45:01

解答

8+11+14+17+20+·······+305=(8+305)*100/2=313*501+2+3+4+···················+98+99+100+99+98+···············+3+2+1=1+2+3+4+···················+...