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

Toán Lớp 7: (x+x+…+x)+(1+2+3+…+10)=165

Toán Lớp 7: (x+x+…+x)+(1+2+3+…+10)=165

Comments ( 2 )

  1. (x+x+…+x)+(1+2+3+…+10)=165
    <=>10x+55=165
    <=>10x=165-55
    <=>10x=110
    <=>x=110:10
    <=>x=11
    #Wuang
     

  2. $(x+x+…+x)+(1+2+3+…+10)=165$
    $Tổng$ $số$ $số$ $hạng$ $x$ $là:$
    (10-1)+1=10
    10x+(1+2+3+..+10)=165
    10x+55=165
    10x=165-55
    10x=110
    x=110:10
    x=11
     

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