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

Toán Lớp 6: 4 ×(3 ×x-4)-2=18 …cảm ơn nha.

Toán Lớp 6: 4 ×(3 ×x-4)-2=18
…cảm ơn nha.

Comments ( 2 )

  1. 4(3x-4)-2=18
    <=>4(3x-4)=18+2
    <=>4(3x-4)=20
    <=>3x-4=20:4
    <=>3x-4=5
    <=>3x=5+4
    <=>3x=9
    <=>x=9:3
    <=>x=3
    Vậy x=3

  2. 4 . (3x – 4) – 2 = 18 
    ⇔ 4 . (3x – 4) = 18 + 2
    ⇔ 4 . (3x – 4) = 20
    ⇔ 3x – 4 = 20 : 4 
    ⇔ 3x – 4 = 5 
    ⇔ 3x = 5 + 4 
    ⇔ 3x = 9 
    ⇔ x = 9 : 3 = 3 
     

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

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