1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 怎么样算才简便
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 怎么样算才简便
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 怎么样算才简便
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 怎么样算才简便
8/9
1/1*2+1/2*3+...+1/8*9=1-1/2+1/2-1/3+1/3-1/4+...+1/8-1/9=1-1/9=8/9