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

Toán Lớp 6: b, ( x – 3) : 5 = 6 ² – 2 ³ . 4

Toán Lớp 6: b, ( x – 3) : 5 = 6 ² – 2 ³ . 4

Comments ( 2 )

  1. $\text{b)(x – 3) ÷ 5 = 6² – 2³ · 4}$
    $\text{⇒ (x – 3) ÷ 5 = 36 – 8 · 4}$
    $\text{⇒ (x – 3) ÷ 5 = 36 – 32}$
    $\text{⇒ (x – 3) ÷ 5 = 4}$
    $\text{⇒ x – 3 = 4 · 5}$
    $\text{⇒ x – 3 = 20}$
    $\text{⇒ x = 20 + 3}$
    $\text{⇒ x = 23}$
    $\text{Vậy x = 23}$
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     (x – 3) : 5 = 6^2 – 2^3 . 4
     (x – 3) : 5 = 36 – 32
     (x – 3) : 5 = 4
           x – 3 = 4 . 5
            x – 3 = 20
                x = 20 + 3
                 x = 23

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