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

Toán Lớp 7: Tìm x : (x – 12).105 = 0 47.(27-x) = 47 2x + 69.2 = 69 .4 2x – 12 -x =0

Toán Lớp 7: Tìm x :
(x – 12).105 = 0
47.(27-x) = 47
2x + 69.2 = 69 .4
2x – 12 -x =0

Comments ( 2 )

  1. (x-12).105=0
    ->(x-12)=0:105
    ->(x-12)=0
    ->x=12
    Vậy x=12
    47.(27-x)=47
    ->(27-x)=1
    ->x=26
    Vậy x=26
    2x+69.2=69.4
    ->2x+138=276
    ->2x=138
    ->x=69
    Vậy x=69
    2x-12-x=0
    ->2x-x=12
    ->1x=12
    ->x=12
    Vậy x=12
    #Wuang
     

  2. (x-12).105=0
    =>x-12=0
    =>x=0+12=12
    Vậy x=12
    ——
    47.(27-x)=47
    =>27-x=47:47=1
    =>x=27-1=26
    Vậy x=26
    ——
    2x + 69.2 = 69 .4
    =>2x +138 =276
    =>2x=138
    =>x=138:2=69
    Vậy x=69
    ——
    2x-12-x=0
    =>x-12=0
    =>x=12
    Vậy x=12

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