1／6+1／12+1／20+1／30+1／42

来源：学生作业帮助网编辑：六六作业网时间：2024/12/24 11:00:20

1／6+1／12+1／20+1／30+1／421／6+1／12+1／20+1／30+1／421／6+1／12+1／20+1／30+1／421／6+1／12+1／20+1／30+1／42=1/2-1/3

1／6+1／12+1／20+1／30+1／42
1／6+1／12+1／20+1／30+1／42

1／6+1／12+1／20+1／30+1／42
=1/2-1/3+1/3-1/4-1/5-1/6+1/6-1/7
=1/2-1/7
=5/14

5/14

=1/2-1/3+1/3-1/4-1/5-1/6+1/6-1/7
=1/2-1/7
=5/14

详细