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

Toán Lớp 7: `x+(29)/(31)-x+(27)/(33)=x+(17)/(43)-x+(15)/(45)` `x-(85)/(15)+x-(74)/(13)+x-(67)/(11)+x-(64)/9=10`

Toán Lớp 7: x+(29)/(31)-x+(27)/(33)=x+(17)/(43)-x+(15)/(45)
x-(85)/(15)+x-(74)/(13)+x-(67)/(11)+x-(64)/9=10

Comments ( 2 )

  1. x+37/31-x+27/33=x+17/43-x+15/45
    <=>29/31+27/33=17/43+15/45
    <=>598/341=94/129
    => sai
    __________________________________________________________
    x-85/15+x-74/13+x-67/11+x-64/9=10
    <=>4x-85/15-74/13-67/11-64/9=10
    <=>4x-24,56099456=10
    <=>4x=34,56099456       
    <=>x=8,64004864         

  2. x + 29/31 – x + 27/33 = x + 17/43 – x + 15/45
    => x – x – x + x = 17/43 + 15/45 – 29/31 – 27/33
    => 0 = 17/43 + 15/45 – 29/31 – 27/33 (không xảy ra )
    Vậy không tìm được x thỏa mãn yêu cầu đề bài.
    x – 85/15 + x – 74/13 + x – 67/11 + x – 64/9 = 10
    => x + x + x + x = 10 + 85/15 + 74/13  + 67/11 + 64/9
    => 4x = 10 + 17/3 +  74/13  + 67/11 + 64/9
    => 4x = 44480/1287
    => x = 44480/1287 : 4
    => x = 11120/1287
    Vậy x  = 11120/1287
     

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

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