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

Toán Lớp 9: giải pt: 2x^4+3x^3-16x^2+3x+2=0. Lm giúp mk nha

Toán Lớp 9: giải pt: 2x^4+3x^3-16x^2+3x+2=0. Lm giúp mk nha

Comments ( 1 )

  1. 2x^4+3x^3-16x^2+3x+2=0
    ⇔(2x^3+4x^2)(x-2)+(x-2)(3x^2+6x)-(x-2)(8x+16)+15(x-2)=0
    ⇔(x-2)(2x^3+7x^2+6x+15)=0
    th1
    x-2=0
    ⇔x=2
    th2
    2x^3+7x^2+6x+15=0
    loại
     

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