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

Toán Lớp 6: [124-(20-4x)]:30=4 Giải giúp mình nhé ^^

Toán Lớp 6: [124-(20-4x)]:30=4
Giải giúp mình nhé ^^

Comments ( 2 )

  1. [124-(20-4x)]:30=4
    =>124-(20-4x)=4xx30
    =>124-(20-4x)=120
    =>20-4x=124-120
    =>20-4x=4
    =>4x=20-4
    =>4x=16
    =>x=16:4
    =>x=4
    Vậy x=4
     

  2. [ 124 – ( 20 – 4x ) ] : 30 = 4
    $\text{⇒[ 124 – ( 20 – 4x ) ] = 4 . 30 }$
    $\text{⇒[ 124 – ( 20 – 4x ) ] = 120 }$
    $\text{⇒              20 – 4x     = 124 – 120}$
    $\text{⇒              20 – 4x     = 4}$
    $\text{⇒                      4x     = 20 – 4}$
    $\text{⇒                       4x     = 16}$
    $\text{⇒                         x     = 16 : 4 }$
    $\text{⇒                          x     = 4}$
    $\text{Vậy x = 4}$
    $\text{#bich2k9}$

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