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

Toán Lớp 8: Làm tính chia: a) (2x^5-5x^3+x^2+3x-1) : (x^2-1) b) (5x^5-2x^4-9x^3+7x^2-18x-3) : (x^2-3)

Toán Lớp 8: Làm tính chia:
a) (2x^5-5x^3+x^2+3x-1) : (x^2-1)
b) (5x^5-2x^4-9x^3+7x^2-18x-3) : (x^2-3)

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     a, (2x^5 – 5x^3 + x^2 + 3x – 1) : (x^2 – 1)
    = ( 2x^5 – 2x^3 – 3x^3 + x^2 + 3x – 1) : (x^2 – 1)
    = [ (2x^5 – 3x^3 + x^2) – (2x^3 – 3x + 1)] : (x^2 – 1)
    = [ x^2(2x^3 – 3x + 1) – (2x^3 – 3x + 1)] : (x^2 – 1)
    = (x^2 – 1)(2x^3 – 3x + 1) : (x^2 – 1)
    = 2x^3 – 3x + 1
    b, (5x^5 – 2x^4 – 9x^3 + 7x^2 – 18x – 3) : (x^2 – 3)
      = (5x^5 – 2x^4 – 15x^3 + 6x^3 + 6x^2 + x^2 – 18x – 3) : (x^2 – 3)
    = [ (5x^5 – 2x^4 + 6x^3 + x^2) – (15x^3 – 6x^2 + 18x + 3)] : (x^2 – 3)
    = [ x^2(5x^3 – 2x^2 + 6x + 1) – 3(5x^3 – 2x^2 + 6x + 1)] : (x^2 – 3)
    = (x^2 – 3)(5x^3 – 2x^2 + 6x + 1) : (x^2 – 3)
    = 5x^3 – 2x^2 + 6x + 1

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

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