1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90怎么解(X/X=几分之几
来源:学生作业帮 编辑:搜狗做题网作业帮 分类:数学作业 时间:2024/05/13 05:36:51
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90怎么解(X/X=几分之几
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)
=1-1/2+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
=1-1/10
=9/10
9/10-1/2=4/10=2/5
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)
=1-1/2+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
=1-1/10
=9/10
9/10-1/2=4/10=2/5
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90怎么解(X/X=几分之几
几分之几=1=几分之几*几分之几=19分之几
几分之几怎么打出来!如x分之1减2怎么打出来!
1米=几分之几+几分之几=几分之几=几分之几
6分之1等于几分之几加几分之几减几分之几
1/6除5=1/6x几分之几=几 8/9除4=8/9x几分之几=几 18除3/8=18x几分之几=几 5除3/4=5x几
几分之几加几分之几等于1/2
几分之几*5分之3等于几分之几,几分之几*3分之1等于几分之几
几分之几*几分之几/几分之几等于1
几分之几加几分之几加几分之几等于1
6分之1=几分之几+几分之几 每个分数只能是分数单位
几分之几加几分之几加几分之几加几分之几加几分之几等于1