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

Toán Lớp 6: 5 . ( 3 – 2x ) + 5 . ( x – 4 ) = 6 – 4x mong mọi người giúc mình ạ

Toán Lớp 6: 5 . ( 3 – 2x ) + 5 . ( x – 4 ) = 6 – 4x mong mọi người giúc mình ạ :<

Comments ( 2 )

  1. Answer
    5 . (3 – 2x) + 5 . (x – 4) = 6 – 4x
    => 15 – 10x + 5x – 20 = 6 – 4x
    => 15 – 10x + 5x – 20 – 6 + 4x = 0
    => (-10x + 5x + 4x) + (15 – 20 – 6) = 0
    => -x – 11 = 0
    => -x = 0 + 11
    => -x = 11
    => x = -11
    $\text{Vậy}$ x = -11

  2. Lời giải chi tiết:
    5.(3-2x)+5.(x-4)=6-4x
    =>15-10x+5x-20=6-4x
    =>-10x+5x+4x=6-20+15
    =>-x=11
    =>x=-11
    Vậy x=-11

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