1/5*8+1/8*11+……+1/98*101 简便方法

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1/5*8+1/8*11+……+1/98*101简便方法1/5*8+1/8*11+……+1/98*101简便方法1/5*8+1/8*11+……+1/98*101简便方法1/5*8+1/8*11+……+

1/5*8+1/8*11+……+1/98*101 简便方法
1/5*8+1/8*11+……+1/98*101 简便方法

1/5*8+1/8*11+……+1/98*101 简便方法
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