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数学题1/3+1/6+1/101/15+1/21+1/28+1/

2009-04-28 20:35:461***
1/3+1/6+1/101/15+1/21+1/28+1/36+1/45数学题1/3+1/6+1/101/15+1/21+1/28+1/36+1/45：1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45=0.?

最佳回答

  • 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45=0.8=4/5 这个是电脑自动执行的结果，手动计算需要通分 12/36+6/36+1/36+9/90+6/90+2/90+4/84+3/84 =19/36+17/90+1/12 =22/36+17/90 =11/18+17/90 =55/90+17/90 =72/90 =8/10 =4/5 =0.8
    2009-04-28 20:45:34
  • 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45 =(1/3+1/6+1/36)+(1/21+1/28)+(1/10+1/15+1/45) =(12/36+6/36+1/36)+(4/84+3/84)+(9/90+6/90+2/90) =19/36+1/12+17/90 =19/36+3/36+17/90 =22/36+17/90 =11/18+17/90 =55/90+17/90 =72/90 =4/5
    2009-04-28 21:03:56
  • 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45=(1-2/3)+(2/3-2/4)+(2/4-2/5)+(2/5-2/6)+(2/6-2/7)+(2/7-2/8)+(2/8-2/9)+(2/9-2/10)=1-2/10=4/5。
    2009-04-28 20:59:42
    • 很赞哦！ (46)

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