Môn Toán Lớp 8: (2×3 + x2 + 2x – 5) : (x – 1) =?

  (2x^3 + x^2 + 2x – 5) : (x – 1)

= (2x^3 – 2x^2 + 3x^2- 3x + 5x – 5) : (x – 1)

= [2x^2.(x  – 1) + 3x.(x – 1) + 5.(x – 1)] : (x – 1)

= [(x – 1).(2x^2 + 3x + 5)] : (x – 1)

= 2x^2 + 3x + 5

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