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

Toán Lớp 8: (24x^3 + 18x^2 – 36x^2 – 27x + 12x + 9) : (12x + 9)

Toán Lớp 8: (24x^3 + 18x^2 – 36x^2 – 27x + 12x + 9) : (12x + 9)

Comments ( 1 )

  1. Giải đáp:
     2x^2 -3x+1
    Lời giải và giải thích chi tiết:
    (24x^3 +18x^2 -36x^2 -27x+12x+9):(12x+9)
    =(24x^3 -18x^2 -15x+9):(12x+9)
    =[3(8x^3 -6x^2 -5x+3)]:[3(4x+3)]
    = (8x^3 -8x^2 +2x^2 -2x-3x+3):(4x+3)
    =[8x^2(x-1)+2x(x-1)-3(x-1)]:(4x+3)
    =[(x-1)(8x^2 +2x-3)]:(4x+3)
    =[(x-1)(8x^2 +6x-4x-3)]:(4x+3)
    ={(x-1)[2x(4x+3)-(4x+3)]}:(4x+3)
    =[(x-1)(4x+3)(2x-1)]:(4x+3)
    =(x-1)(2x-1)
    =2x^2 -x-2x+1
    =2x^2 -3x+1

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

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