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

Toán Lớp 8: ( 6^3 – x^2 + 5x – 1 ) : ( 2x-1)

Toán Lớp 8: ( 6^3 – x^2 + 5x – 1 ) : ( 2x-1)

Comments ( 2 )

  1. 6x^3 -x^2+5x-1
    = 6x^3 – 3x^2 +2x^2 -x + 6x -3 +2
    = 3x^2(2x-1) + x(2x-1) + 3(2x-1) +2
    = (3x^2 +x+3)(2x-1) +2 
    $\\$
    Vì (3x^2+x+3)(2x-1) \vdots (2x-1) . Vậy nên (3x^2+x+3)(2x-1) +2 : (2x-1) dư 2 .    

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

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