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

Toán Lớp 8: (2x-2).(3x+2).(3-x) Giúp mình vơiiiiii

Toán Lớp 8: (2x-2).(3x+2).(3-x)
Giúp mình vơiiiiii

Comments ( 2 )

  1. (2x-1)(3x+2)(3-x)
    =(6x^2+x-2)(3-x)
    =18x^2-6x^3+3x-x^2-16+2x
    =17x^2-6x^3+5x-6
     

  2. Giải đáp:
        ( 2x -1) ( 3x + 2)(3 – x)
    = 2x ( 3x +2)( 3-x) – 1( 3x + 2)(3 – x)
    = 2x ( 9x – 3x^2 + 6 – 2x ) – 1( 9x – 3x^2 + 6  – 2x)
    = 18x^2 – 6x^3 + 12x – 4x^2 – 9x + 3x^2 – 6 + 2x
    = – 6x^3 + 18x^2 – 4x^2 + 3x^2+ 12x  – 9x   + 2x- 6
    = -6x^3 + 17x^2 + 5x -6
    xin hay nhất ạ
     

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

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