1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,

来源：学生作业帮助网编辑：作业帮时间：2024/05/06 00:31:03

1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,

1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8