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

Toán Lớp 8: Phân tíchđa thức thành nhân tử :2x^2-2x-4

Toán Lớp 8: Phân tíchđa thức thành nhân tử :2x^2-2x-4

Comments ( 2 )

  1. Giải đáp:
     2x^2 – 2x – 4
    = 2x^2 – 4x + 2x – 4
    = (2x^2 – 4x) + (2x – 4)
    = 2x(x – 2) + 2(x – 2)
    = (x – 2)(2x + 2)
    = (x – 2)(x + 1).2
    C2: 2x^2 – 2x – 4
    = 2(x^2 – x – 2)
    = 2(x^2 – 2x + x – 2)
    = 2[x(x – 2) + (x – 2)]
    = 2(x – 2)(x + 1)

  2.  2x^2 – 2x – 4
    = 2x^{2} – 4x + 2x – 4
    = (2x^{2} – 4x) + (2x – 4)
    = 2x(x – 2) + 2(x – 2)
    = (x – 2)(2x + 2)
    = (x – 2)(x + 1).2
    $\text{#Apples}$
     

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