1⼀5*8+1⼀8*11+……+1⼀98*101 简便方法

2025-06-21 14:41:11
推荐回答(1个)
回答1:

1/5*8+1/8*11+……+1/98*101
=(1/3)*(1/5-1/8+1/8-1/11+...+1/98-1/101)
=1/3*(1/5-1/101)
=1/3*96/505
=32/505