1/2+1/6+1/12+1/20(简算)
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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(简算)1/2+1/6+1/12+1/20=1/2+1/2-1/3+1/3-1/4
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(简算)
1/2+1/6+1/12+1/20
=1/2+1/2-1/3+1/3-1/4+1/4-1/5
=1-1/5
=4/5
1/2+1/6+1/12+1/20
= 1/2+(1/6+1/12)+1/20
= 1/2+1/4+1/20
= 1/2+(1/4+1/20)
= 1/2+3/10
= 8/10
= 4/5
答案等于4/5
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,
1/2+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
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,
1/2+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
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:1/6+1/12+1/20+1/30+.1/72+1/90