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小学六年级数学:十二分之七减二十分之九加三十分之...

7/12-9/20+11/30-42 =35/60-27/60+22/60-42 =30/60-42 =1/2-42 =-41.5

7/12-9/20+11/30-13/42+15/56-17/72 =(42-17)/72-(27-22)/60-(52-45)/168 =25/72-1/12-1/24 =25/72-(2+1)/24 =25/72-1/8 =(25-9)/72 =2/9

1/3-7/12+9/20-11/30+13/42-15/56 =1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6,+(1/6+1/7)-(1/7+1/8) =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+1/3-7/12+9/20-11/30+13/42-15/56 =1+1/3-(1/3+1/4)+(1/4+1/5)-(1/5+1/6)+(1/6+1/7)-(1/7+1/8) =1+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8 =1-1/8 =7/8

1减六分之五加十二分之七减二十分之九加三十分之十一减四十二分之十三加五十六分之十五 =1-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8) =1-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-...

5/6-7/12+9/20-11/30+13/42 =1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7 =1/2+1/7 =9/14 拆分 相消 得到结果 望采纳 谢谢! 可以采纳吗?

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