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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 4: tính A=1/5+1/15+1/45+1/135+1/405+1/1215+1/ 3645(ghi đầy đủ a=…2a=…)(phân số viết dưới dạng a/b)

Toán Lớp 4: tính A=1/5+1/15+1/45+1/135+1/405+1/1215+1/ 3645(ghi đầy đủ a=…2a=…)(phân số viết dưới dạng a/b)

Comments ( 2 )

  1. A=1/5+1/15+1/45+1/135+1/405+1/1215+1/ 3645
    =(1/5+1/15)+(1/45+1/135)+(1/405+1/1215)+1/ 3645
    =(4/15+4/135)+(4/1215+1/3645)
    =8/27+13/3645
     =1093/3645

  2. #laviken#
    A=1/5+1/15+1/45+1/135+1/405+1/1215+1/3645
    =729/3645+243/3645+81/3645+27/3645+9/3645+3/3645+1/3645
    =(729+243+81+27+9++3+1)/3645
    =1093/3645

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222-9+11+12:2*14+14 = ? ( )

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