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

Toán Lớp 8: Phân tích đa thức thành nhân tử: a,x^2-5x+4 b,x^5+4x

Toán Lớp 8: Phân tích đa thức thành nhân tử:
a,x^2-5x+4
b,x^5+4x

Comments ( 2 )

  1. a) x^2- 5x+ 4
    = x^2-x-4x+4
    = x(x-1)-4(x-1)
    = (x-1)(x-4)
    —————
    b) x^5 +4x
    = x(x^4+4)
    = x [(x^2)^2 + 2^2]
    = x(x^2- 2x+2)(x^2+2x+2)

  2. Answer
    a, x^{2} – 5x + 4
    = x^{2} – x – 4x + 4
    = (x^{2} – x) – (4x – 4)
    = x . (x – 1) – 4 . (x – 1)
    = (x – 4) . (x – 1)
    ____________________
    b, x^{5} + 4x
    = x . (x^{4} + 4)
    = x . [(x^{2})^{2} + 2^{2}]
    = x . (x^{2} – 2x + 2) . (x^{2} + 2x + 2)

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

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