8+11+14+17+20+·······+305 数学计算题.呜呜呜

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/21 09:12:42

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

8+11+14+17+20+·······+305
=(8+305)*100/2=313*50
1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
=1+2+3+4+···················+98+99++100+100+99+98+···············+3+2+1-100
=(1+2+3+4+···················+98+99++100)+(1+2+3+4+···················+98+99++100)-100
=10000

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