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

Toán Lớp 6: 40-3(x+1)=16 giúp mình với nhé

Toán Lớp 6: 40-3(x+1)=16 giúp mình với nhé

Comments ( 2 )

  1. 40 – 3 ( x + 1 ) = 16
    ⇔ 40 – 3x – 3 = 16
    ⇔ 37 – 3x = 16
    ⇔ – 3x = 16 – 37
    ⇔ – 3x = – 21
    ⇔ x = – 21 : ( – 3 )
    ⇔ x = 7
    Vậy x = 7

  2. 40 – 3( x + 1 ) = 16
    => 3( x + 1 ) = 40 – 16
    => 3( x + 1 ) = 24
    => x + 1 = 24 : 3
    => x + 1 = 8
    => x = 8 – 1
    => x = 7
      $Vậy$ x = 7
     

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