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

Toán Lớp 8: 3.(1 -4.x).(x-1)+4.(3.x-2).(x+3) = -27

Toán Lớp 8: 3.(1 -4.x).(x-1)+4.(3.x-2).(x+3) = -27

Comments ( 2 )

  1. Giải đáp:
        3. ( 1- 4x ) ( x- 1) + 4( 3x -2) .(x +3) = -27
    => 3. ( x -1 – 4x^2 + 4x) + 4( 3x^2 + 9x – 2x -6)=-27
    => 3x – 3 – 12x^2 + 12x + 12x^2 + 36x – 8x – 24= -27
    => -12x^2 + 12x^2 + 3x – 8x + 36x + 12x – 24 -3= -27
    => 43x -27= -27
    => 43x  = -27 + 27
    => 43x = 0
    => x= 0
    mong ctlhn ạ~~
     

  2. Giải đáp + Lời giải và giải thích chi tiết:
    3(1-4x)(x-1)+4(3x-2)(x+3)=-27
    <=>3(x-1-4x^2+4x)+4(3x^2+9x-2x-6)=-27
    <=>3x-3-12x^2+12x+12x^2+36x-8x-24=-27
    <=>43x-27=-27
    <=>43x=0
    <=>x=0
    Vậy S={0}.
     

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

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