简算:1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
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1/2+1/6+1/12+1/20(简算)
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,
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=?简算
1/2+1/6+1/12+1/20+1/30.+1/9900(简算)
1/2+1/6+1/12+1/20+.+1/72+1/90简算
1/2+1/6+1/12+1/20+…+1/72+1/90简算
简算:1/6+1/12+1/20+1/30+.1/72+1/90
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
1/2+1/6+1/12+1/20+1/30=?简算
简算:1/2+1/6+1/12+1/20+……+1/380
1/2+1/6+1/12+1/20+1/30=?简算
简算:1/2+1/6+1/12+1/20+1/30/就是分数线,
1/6+1/12+1/20+1/30+1/42(简算) 急!
1/6+1/12+1/20+1/30+1/42 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算