1/3+1/3+1/6+1/12+1/24+1/48+1/96
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1/2+1/3+1/4+1/6+1/12+1/48+1/56
计算:1/6-(+1/3)-(-1/12)
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
1/3+1/6+1/9+1/12+1/15
已知1/2=1-1/2,1/6=1/2-1/3,1/12=1/3-1/4.计算1/2+1/6+1/12+1/201/30+1/42+1/56+1/72+1/90=?
计算 2/3+1/6+1/12+1/24+1/48+1/96+1/192
1-2/3-1/6-1/12-1/24-1/48-……1/768
1-2/3-1/6-1/12-1/24-1/48-...-1/768=?
-1/3〔-1/2(-1-x)-1/6〕-1/12=-1/24
递等式计算 1/2-1/3+1/4-1/5+1/6-1/12
1/2-1/3+1/4-1/5+1/6-1/12
简便计算下题.1/2-1/3+1/4-1/5+1/6-1/12
(1)1-1/2-1/6-1/12-1/20-...-1/9900(2)1/2+1/6+1/12+1/20+...+1/9900(3)1/3+1/15+1/35+1/63+...+1/9999
找规律填空:1/12,1/6,1/4,1/3,5/12,1/2,().
按规律写数:1/12,1/6,1/4,1/3,5/12,1/2,( )
如果1/6=1/2-1/3,1/12=1/3-1/4那么1/6+1/12+1/20+.+1/9900结果是多少?不用方程
1/2+1/6+1/12+1/20+1/30;1/2×3+1/3×4+1/4×5+1/5×6+1/6x7
1/2=1/1-1/2;1/6=1/2-1/3;1/12=1/3-1/4.根据以上规律,计算:1/2+1/6+1/12+20/1+30/1+1/42+1/561/2=1/1-1/2;1/6=1/2-1/3;1/12=1/3-1/4.根据以上规律,计算:1/2+1/6+1/12+1/20+1/30+1/42+1/56