简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
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简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
题有误,应为
1/6+1/12+1/20+1/30+1/42+1/56*1/72+1/90
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/2-1/10
=0.4
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:1/6+1/12+1/20+1/30+.1/72+1/90
1/2+1/6+1/12+1/20+1/30=?简算
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
简算:1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
简算6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1
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,快
2分之1+6分之1+12分之1+20分之1+30分之1+…+9900分之1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
简算.-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90-1/10