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

Toán Lớp 12: Rút gọn biểu thức : A = ( 3x – 2 ) ( 2x – 1 ) – x ( 6x – 4 )

Toán Lớp 12: Rút gọn biểu thức : A = ( 3x – 2 ) ( 2x – 1 ) – x ( 6x – 4 )

Comments ( 2 )

  1. A=(3x-2)(2x-1)-x(6x-4)
    =3x.2x-3x.1-2.2x+2.1-6x.x+4.x
    =6x^2-3x-4x+2-6x^2+4x
    =6x^2-6x^2-4x+4x-3x+2
    =0-0-3x+2
    =-3x+2

  2. A = 3x ( 2x -1) -2(2x-1) – 6x² + 4x
    = 6x² – 3x – 4x + 2 – 6x² + 4x
    = (6x² – 6x²) – (3x + 4x – 4x) + 2
    = – 3x + 2
    Vậy A = – 3x + 2
     

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