对了给分10
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90-1/100
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10-1/100
=1/2-1/10-1/100
=4/10-1/100
=39/100
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10-1/100
=1/2-1/10-1/100
=4/10-1/100
=39/100
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