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

Toán Lớp 8: phân tích đa thức thành nhân tử : x ³ – 7x + 6

Toán Lớp 8: phân tích đa thức thành nhân tử : x ³ – 7x + 6

Comments ( 2 )

  1. x^3-7x+6
    =x^3-x^2+x^2-x-6x+6
    =x^2(x-1)+x(x-1)-6(x-1)
    =(x-1)(x^2+x-6).
    = (x – 1)(x^2 + 3x – 2x – 6)
    = (x – 1)[x(x + 3) – 2(x + 3)]
    = (x – 1)(x + 3)(x – 2)
    Xin hay nhất

  2. x³ – 7x + 6 
    = x³ – x² + x² – x – 6x + 6
    = x²(x – 1) + x(x – 1) – 6(x – 1)
    = (x – 1)(x² + x – 6)
    = (x – 1)(x² + 3x – 2x – 6)
    = (x – 1)[x(x + 3) – 2(x + 3)]
    = (x – 1)(x + 3)(x – 2)

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