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

Toán Lớp 8: giúp với,7 giờ rưỡi nộp r,hứa vote 5 sao 3x^3-6x^2+9x=0 3x^3-12^2+12x=0

Toán Lớp 8: giúp với,7 giờ rưỡi nộp r,hứa vote 5 sao
3x^3-6x^2+9x=0
3x^3-12^2+12x=0

Comments ( 2 )

  1. Giải đáp:
    3x^3-6x^2+9x=0
    ⇔3x(x^2-2x+3)=0
    ⇔3x(x-3)(x+1)
    ⇔3x=0; x-3=0; x+1=0
    ⇔x=0; x=3; x=-1
    3x^3-12x^2+12x=0
    ⇔3x(x^2-4x+4)
    ⇔3x(x-2)^2
    ⇔3x=0: x-2=0
    ⇔3x=0; x=-2

  2. 3x^3-6x^2-9x=0
    3x(x−3)(x+1)=0
    –> x=0
         x=3
         x=-1
    ⇔3x(x2+4x+4)=0 \\
    ⇔3x(x+2)2=0
    ⇔ [ 3x=0 
         x+2=0
    x=0
    x=−2
    ⇔[x=0
         x=−2

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

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