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

Toán Lớp 8: x -[-x + (x + 3)] -[(x + 3)-( x – 2)] = 0

Toán Lớp 8: x -[-x + (x + 3)] -[(x + 3)-( x – 2)] = 0

Comments ( 2 )

  1. x – [ -x + ( x + 3 ) ] – [ ( x + 3 ) – ( x – 2 ) ] =0
    ⇒ x – ( -x + x + 3 ) – ( x + 3 – x + 2 ) =0
    ⇒ x – 3 – 5 =0
    ⇒ x -8 =0
    ⇒ x =8
    Vậy x =8  

  2. \text{~Bạn tham khảo~}
    $x – [ -x + ( x + 3 ) ] – [ ( x + 3 ) – ( x – 2 ) ] =0$
    $⇒ x – ( -x + x + 3 ) – ( x + 3 – x + 2 ) =0$
    $⇒ x – 3 – 5 =0$
    $⇔ x -8 =0$
    $⇔ x =8$
    \text{Vậy x = 8}
     

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