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

Toán Lớp 7: 2 . ( x – 3 ) – 3 .( x – 5 ) = 4 . ( 3 – x ) – 18 Tìm x

Toán Lớp 7: 2 . ( x – 3 ) – 3 .( x – 5 ) = 4 . ( 3 – x ) – 18
Tìm x

Comments ( 2 )

  1. Giải đáp và Lời giải và giải thích chi tiết:
    ${2 . ( x – 3 ) – 3 .( x – 5 ) = 4 . ( 3 – x ) – 18}$
    $⇔{}2x−6−3(x−5)=4(3−x)−18$
    $⇔{2x−6−3x+15=4(3−x)−18}$
    $⇔{−x−6+15=4(3−x)−18}$
    $⇔{−x+9=4(3−x)−18}$
    $⇔{−x+9=12−4x−18}$
    $⇔{−x+9=−6−4x}$
    $⇔{−x+9+4x=−6}$
    $⇔{3x+9=−6}$
    $⇔3x=−6−9$
    $⇔{3x=-15}$
    $⇔x=\dfrac{-15}{3}$
    $x={-5}$
    Vậy $x=-5$
     

  2. Giải đáp:
    2.( x – 3 ) – 3.( x – 5 ) = 4.( 3 – x ) – 18
    2x – 6 – 3x + 15 = 12 – 4x – 18
    2x – 3x + 4x = 12 – 18 + 6 – 15
    3x = – 15
    x = – 15 : 3
    x = – 5
    #AkiSha2007
     

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