\4*5+1\5*6+1\6*7.1\39*40
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 07:03:52
\4*5+1\5*6+1\6*7.1\39*40
\4*5+1\5*6+1\6*7.1\39*40
\4*5+1\5*6+1\6*7.1\39*40
1 \4*5+1\5*6+1\6*7.1\39*40
=1/4-1/5+1/5-1/6+……+1/39-1/40
=1/4-1/40
=9/40
太简单了
\4*5+1\5*6+1\6*7.1\39*40
\4*5+1\5*6+1\6*7.1\39*40
\4*5+1\5*6+1\6*7.1\39*40
1 \4*5+1\5*6+1\6*7.1\39*40
=1/4-1/5+1/5-1/6+……+1/39-1/40
=1/4-1/40
=9/40
太简单了