1/2+1/6+1/12+1/20(简算)
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,
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)=?
1/2+1/6+1/12+1/20+.+1/72+1/90简算
2/1+6/1+12/1+20/1+30/1+42/1简算
1/2+1/6+1/12+1/20+…+1/72+1/90简算
简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
简算:1/2+1/6+1/12+1/20+……+1/380
简算:1/2+1/6+1/12+1/20+1/30
1/2+1/6+1/12+1/20+1/30=?简算