1／6+1／12+1／20+1／30+1／42

来源：学生作业学帮网编辑：学帮网时间：2024/06/05 13:39:04

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

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