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

Toán Lớp 6: i,15+(x-1)^3=42 (giúp em với ạ)

Toán Lớp 6: i,15+(x-1)^3=42
(giúp em với ạ)

Comments ( 2 )

  1. $\text{15 + ( x – 1 )³ = 42}$
    $\text{( x – 1 )³ = 42 – 15}$
    $\text{( x – 1 )³ = 27}$
    $\text{27 = 3³}$
    $\text{⇒ x – 1 = 3}$
          $\text{x = 3 + 1}$
            $\text{x = 4}$
    $\text{Xin hay nhất và 5 sao ạ}$

  2. i) 15+(x-1)^3= 42
    (x-1)^3= 42-15
    (x-1)^3= 27
    (x-1)^3= 3^3
    ⇒ x-1= 3
    ⇒ x= 3+1
    ⇒ x= 4
    #namOvO
     

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