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

Toán Lớp 8: Phân tích đa thức thành nhân tử: `x(x+1)(x+2)(x+3) – 24`

Toán Lớp 8: Phân tích đa thức thành nhân tử:
x(x+1)(x+2)(x+3) – 24

Comments ( 1 )

  1. $\\$
    x(x+1)(x+2)(x+3)-24
    = [x(x+3)][(x+1)(x+2)] – 24
    = (x^2+3x)(x^2+2x+x+2)-24
    =(x^2+3x)(x^2+3x+2)-24
    Đặt t=x^2+3x
    =t(t+2)-24
    =t^2+2t-24
    =t^2 – 4t + 6t-24
    =t(t-4)+6(t-4)
    =(t-4)(t+6)
    =(x^2+3x-4)(x^2+3x+6)
    =(x^2-x+4x-4)(x^2+3x+6)
    = [x(x-1)+4(x-1)](x^2+3x+6)
    =(x-1)(x+4)(x^2+3x+6)
     

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