\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：2024/07/11 15:43:47
\4*5+1\5*6+1\6*7.1\39*40
x)12612fZz1ƖZ&6IE% l5T+mkokTo ʹ5," GUYXyvP'؀9Ozi'ڐ9>%

\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