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

Toán Lớp 8: Toán 8 Tính a (x-2)(x²+3x-4) b (x-2)(x-x²+4)

Toán Lớp 8: Toán 8
Tính
a (x-2)(x²+3x-4)
b (x-2)(x-x²+4)

Comments ( 2 )

  1. a)(x – 2)(x^{2} + 3x – 4)
    = x^{3} + 3x^{2} – 4x – 2x^{2} – 6x + 8
    = x^{3} + x^{2} – 10x + 8
    b) (x – 2)(x – x^{2} + 4)
    = x^{2} – x^{3} + 4x – 2x + 2x^{2} – 8
    = x^{3} + x^{2} + 2x – 8
     

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