1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,
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1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,1/20+1/30+1/42+1/56+.+1/13
1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,
1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,
1/20+1/30+1/42+1/56+.+1/132=?简便运算谢谢了,
原式=1/4*1/5+1/5*1/6+1/6*1/7+...+1/11*1/12=1/4-1/5+1/5-1/6+1/6-1/7+...+1/11-1/12=1/4-1/12=1/6
1/(4*5)+1/(5*6)+…1/(12*11)=1/4-1/5+1/5-1/6+…+1/11-1/12
1/20+1/30+1/42+1/56简便计算,
1/20+1/30+1/42+1/56=1/20+1/30+1/42+1/56=
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
1/2+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,
1/12+1/20+1/30+1/42+1/56+1/72+1/90
简便运算：1/2+1/6+1/12+1/20+1/30+1/42+1/56
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/12+1/20+1/30+1/42+1/56+1/72+1/90
1/6+1/12+1/20+1/30+1/42+1/56+1/72 简便计算
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+1/42+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=
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
1/2+1/6+1/12+1/20+1/30+1/42+1/56