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

Toán Lớp 8: Ai bt câu này ko x^3-4x^2-8x+8

Toán Lớp 8: Ai bt câu này ko
x^3-4x^2-8x+8

Comments ( 2 )

  1. x^3 – 4x^2 – 8x + 8
    = x^3 – 6x^2 + 2x^2 + 4x – 12x + 8
    = (x^3 – 6x^2 + 4x) + (2x^2 – 12x + 8)
    = x (x^2 – 6x + 4) + 2 (x^2 – 6x + 4)
    = (x^2 – 6x + 4)(x + 2) 

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