计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

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计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90计算1/2+1/6+1/

计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
拆项
=9/10