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

Toán Lớp 8: x ³ – 3x ² – 3x +1 giúp mình với nha

Toán Lớp 8: x ³ – 3x ² – 3x +1 giúp mình với nha

Comments ( 2 )

  1. x^3-3x^2-3x+1
    =(x^3+1)-(3x^2+3x)
    =(x+1)(x^2-x+1)-3x(x+1)
    =(x+1)(x^2-x+1-3x)
    =(x+1)(x^2-4x+1)
    Sửa x^3-3x^2+3x-1
    =x^3-3.x^2.1+3.x.1-1^3
    =(x-1)^3

  2. x^{3} – 3x^{2} – 3x + 1
    = (x^{3} + 1) – ( 3x^{2} + 3x )
    = ( x + 1)( x^{2} – x + 1) – 3x( x + 1)
    = ( x + 1)( x^{2} – x + 1 – x – 1)
    = ( x + 1)( x^{2} – 2x )

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

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