作业帮1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
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x)3767bC H$VΆ4m
u!ʍ1H!6Ҧ ̀96P9_\gr 7
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