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

Toán Lớp 8: Tìm x biết 4(18 – 5x) – 12(3x – 7) = 15(2x – 16) – 6(x + 14)

Toán Lớp 8: Tìm x biết
4(18 – 5x) – 12(3x – 7) = 15(2x – 16) – 6(x + 14)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    4 (18−5x)−12(3x−7)=15(2x−16)−6(x+14)
    ⇒72−20x−36x+84=30x−240−6x−84
    ⇒−20x−36x−30x+6x=−240−84−72−84
    ⇒−80x=−480
    ⇒ x=6

  2. Ta có :
    4( 18 – 5x ) – 12( 3x – 7 ) = 15( 2x – 16 ) – 6( x + 14 )
    ⇔ 4.18 – 4.5x – 12.3x – 12.( – 7 ) = 15.2x – 15.16 – 6.x – 6.14
    ⇔ 156 – 56x = 24x – 324 ⇔ 56x + 24x = 156 + 324
    ⇔ 80x = 480 ⇔ x = 6.
     

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

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