分数计算1/2+1/6+1/12+1/20+1/30+1/42+
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 要写出计算过程
=(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)+(1/8-1/9)+(1/9-1/10) =1-1/10 =9/10