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

Toán Lớp 8: Phân tích đa thức sau thành nhân tử: `27x^3−27x^2+18x−4`

Toán Lớp 8: Phân tích đa thức sau thành nhân tử:
27x^3−27x^2+18x−4

Comments ( 2 )

  1. 27x^3-27x^2+18x-4 
    =27x^3-9x^2-18x^2+6x+12x-4
    =9x^2(3x-1)-6x(3x-1)+4(3x-1)
    =(9x^2-6x+4)(3x-1)

  2. $\\$
    27x^3 – 27x^2 + 18x – 4
    = 27x^3 – 9x^2 – 18x^2 + 6x + 12x – 4
    = (27x^3 – 9x^2) – (18x^2 – 6x)+(12x-4)
    = 9x^2 (3x-1) – 6x (3x-1) + 4 (3x-1)
    = (3x-1)(9x^2 – 6x+4)
     

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