简算题:1/2+1/6+1/12+1/20+1/30+1/42

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简算题:1/2+1/6+1/12+1/20+1/30+1/42简算题:1/2+1/6+1/12+1/20+1/30+1/42简算题:1/2+1/6+1/12+1/20+1/30+1/42(1-1/2)

简算题:1/2+1/6+1/12+1/20+1/30+1/42
简算题:1/2+1/6+1/12+1/20+1/30+1/42

简算题:1/2+1/6+1/12+1/20+1/30+1/42
(1-1/2)+(1/2-1/3)+……(1/6-1/7)=1-1/7=6/7