2/1+6/1+12/1+20/1+30/1+42/1=?发现了什么规律
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2/1+6/1+12/1+20/1+30/1+42/1=?发现了什么规律
2/1+6/1+12/1+20/1+30/1+42/1=?发现了什么规律
2/1+6/1+12/1+20/1+30/1+42/1=?发现了什么规律
1/2=1/(1*2)=1/1-1/2=1/2
1/2+1/6=(1/1-1/2)+(1/2-1/3)=1/1-1/3=2/3
同理,1/12拆分成1/(3*4)=1/3-1/4,那么1/2+1/6+1/12=1-1/4=3/4
同理,1/42=1/6-1/7,那么上式得6/7
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2,-1/6,1/12,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1+1/2+1/6+1/12+1/20+1/30.+1/901+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+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
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=