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

Toán Lớp 8: a,6x-3 /5x^2 +x nhân 25x^2 +10x +1/ 1-8x^3

Toán Lớp 8: a,6x-3 /5x^2 +x nhân 25x^2 +10x +1/ 1-8x^3

Comments ( 1 )

  1. a) (6x-3)/(5x^2+x).(25x^2+10x+1)/(1-8x^3)
    =(-(3-6x))/(5x^2+x).(25x^2+10x+1)/(1-8x^3)
    =(-3(1-2x))/(x(5x+1)).((5x+1)^2)/((1-2x)(1+2x+4x^2))
    =(-3(1-2x)(5x+1)^2)/(x(5x+1)(1-2x)(1+2x+4x^2))
    =(-3(5x+1))/(x(1+2x+4x^2))
    =(-15x-3)/(x+2x^2+4x^3)
     

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