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

Toán Lớp 8: (x+5) (x^2-3x+1) mik đang cần gấp nha mn giúp mik vs

Toán Lớp 8: (x+5) (x^2-3x+1) mik đang cần gấp nha mn giúp mik vs

Comments ( 2 )

  1. Answer
    (x + 5) . (x^{2} – 3x + 1)
    = (x . x^{2}) – (x . 3x) + (x . 1) + (5 . x^{2}) – (5 . 3x) + (5 . 1)
    = x^{3} – 3x^{2} + x + 5x^{2} – 15x + 5
    = x^{3} + (5x^{2} – 3x^{2}) + (x – 15x) + 5
    = x^{3} + 2x^{2} – 14x + 5

  2. (x+5)(x^2 – 3x +1)
    = x.x^2 – x.3x + x.1 + 5.x^2 + 5.(-3x) + 5.1
    = x^3 – 3x^2 + x + 5x^2 – 15x + 5
    = x^3 + 2x^2 – 14x +5
     

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