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

Toán Lớp 8: Phân tích đa thức sau thành nhân tử: a, x^2-9x+18 b, x^2-6x+8 c, x^2-5x-14

Toán Lớp 8: Phân tích đa thức sau thành nhân tử:
a, x^2-9x+18
b, x^2-6x+8
c, x^2-5x-14

Comments ( 2 )

  1. @kem
    a, x^2 – 9x + 18
    = x^2 – 3x – 6x + 18
    = x(x – 3) – 6(x – 3)
    = (x – 3)(x – 6)
    b, x^2-6x+8
    = x^2 – 2x – 4x + 8
    = x(x – 2) – 4(x – 2)
    = (x – 2)(x – 4)
    c, x^2-5x-14
    = x^2 + 2x – 7x – 14
    = x(x + 2) – 7(x + 2)
    = (x + 2)(x – 7)

  2. ~ Bạn tham khảo ~
    a, x^2 – 9x + 18
    = x^2 – 3x – 6x + 18
    = x(x-3) – 6(x-3)
    = (x-3)(x-6)
    b, x^2 – 6x + 8
    = x^2 – 2x – 4x + 8
    = x(x-2) – 4(x-2)
    = (x-2)(x-4)
    c, x^2 – 5x -14
    = x^2 + 2x – 7x – 14
    = x(x+2) – 7(x+2)
    = (x-7)(x+2)

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

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