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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. 4(18-5x)-12(3x-7)=15(2x-16)-6(x+14)
    <=>72-20x-36x+84=30x-240-6x-84
    <=>-56x+156=24x-324
    <=>-56x-24x=-156-324
    <=>-80x=-480
    <=>80x=480
    <=>x=6
    vậy S={6} 
     

  2. 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 ) + ( 72 + 84 ) = ( 30x – 6x ) + ( -240 – 84 )
    -56x + 156 = 24x – 324
    -56x – 24x = -324 – 156
    -80x = -480
    x = ( -480 ) : ( -80 )
    x = 6
    Vậy x = 6
    CHÚC BẠN HỌC TỐT

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

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