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

Toán Lớp 6: 3x – 2 = 19 [ 43 – ( 56 – x )] . 12 = 384

Toán Lớp 6: 3x – 2 = 19
[ 43 – ( 56 – x )] . 12 = 384

Comments ( 2 )

  1. Giải đáp:
    x=7
    x=45
    Lời giải và giải thích chi tiết:
     3x-2=19
     3x=19+2
     3x=21
       x=21:3
       x=7
    Vậy x=7
    ________________________
    [43-(56-x)].12=384
     43-(56-x)=384:12
     43-(56-x)=32
           56-x=43-32
           56-x=11
                x=56-11
                x=45
    Vậy x=45

  2. 3x – 2 = 19
    $\Rightarrow$ 3x = 19 + 2
    $\Rightarrow$ 3x = 21
    $\Rightarrow$ x = 21 : 3
    $\Rightarrow$ x = 7
      $Vậy$ x = 7
    $\text{ ___________________________ }$
    [ 43 – ( 56 – x ) ]. 12 = 384
    $\Rightarrow$ 43 – 56 + x = 384 : 12
    $\Rightarrow$ -13 + x = 32
    $\Rightarrow$ x = 32 + 13
    $\Rightarrow$ x = 45
      $Vậy$ x = 45
     

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

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