怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”
怎样简算“1/2+1/6+1/12+1/20+1/30+1/42+1/56”
数学人气:293 ℃时间:2019-11-19 05:22:43
优质解答
1/2+1/6+1/12+1/20+1/30+1/42+1/56=(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)=1-1/8=7/8
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